PROGRAMMING
c mouse programs
Mouse programs using c :- Do everything with mouse using these c programs or source codes, on this page you will find sample mouse programs using c. Programs ranging from how to use mouse in c graphics and in text mode. how to initialize mouse, how to know where the mouse is clicked, which mouse button is clicked i.e left or right, how to restrict mouse pointer. Below is a list of mouse programs made using c language. Mouse interrupt is handled using int86 function of dos.h header file. All these programs have been made using turbo c compiler.
C programming examples
C programming examples: These programs illustrate various programming elements, concepts such as using operators, loops, functions, single and double dimensional arrays, performing operations on strings, files, pointers etc. Browse the code from simple c program to complicated ones you are looking for, every one of them is provided with output. C program download with executable files, so that you save on your computer and run programs without compiling the source code. All programs are made using c programming language and Codeblocks, most of these will work under Dev C++ compiler also. Download software you need to develop codes. The first program prints "Hello World" on screen.
C programming codes
Hello world
Print Integer
Addition
Odd or Even
Add, subtract, multiply and divide
Check vowel
Leap year
C program examples
Example 1 - C hello world program
/* A very simple c program printing a string on screen*/
#include <stdio.h>
main()
{
printf("Hello World\n");
return 0;
}
Output of above program:
"Hello World"
Example 2 - c program to take input from user using scanf
#include <stdio.h>
main()
{
int number;
printf("Enter an integer\n");
scanf("%d",&number);
printf("Integer entered by you is %d\n", number);
return 0;
}
Output:
Enter a number
5
Number entered by you is 5
Example 3 - using if else control instructions
#include <stdio.h>
main()
{
int x = 1;
if ( x == 1 )
printf("x is equal to one.\n");
else
printf("For comparison use == as = is the assignment operator.\n");
return 0;
}
Output:
x is equal to one.
Example 4 - loop example
#include <stdio.h>
main()
{
int value = 1;
while(value<=3)
{
printf("Value is %d\n", value);
value++;
}
return 0;
}
Output:
Value is 1
Value is 2
Value is 3
Example 5 - c program for prime number
#include <stdio.h>
main()
{
int n, c;
printf("Enter a number\n");
scanf("%d", &n);
if ( n == 2 )
printf("Prime number.\n");
else
{
for ( c = 2 ; c <= n - 1 ; c++ )
{
if ( n % c == 0 )
break;
}
if ( c != n )
printf("Not prime.\n");
else
printf("Prime number.\n");
}
return 0;
}
Example 6 - command line arguments
#include <stdio.h>
main(int argc, char *argv[])
{
int c;
printf("Number of command line arguments passed: %d\n", argc);
for ( c = 0 ; c < argc ; c++)
printf("%d. Command line argument passed is %s\n", c+1, argv[c]);
return 0;
}
Above c program prints the number and all arguments which are passed to it.
Example 7 - Array program
#include <stdio.h>
main()
{
int array[100], n, c;
printf("Enter the number of elements in array\n");
scanf("%d", &n);
printf("Enter %d elements\n", n);
for ( c = 0 ; c < n ; c++ )
scanf("%d", &array[c]);
printf("Array elements entered by you are:\n");
for ( c = 0 ; c < n ; c++ )
printf("array[%d] = %d\n", c, array[c]);
return 0;
}
Example 8 - function program
#include <stdio.h>
void my_function();
main()
{
printf("Main function.\n");
my_function();
printf("Back in function main.\n");
return 0;
}
void my_function()
{
printf("Welcome to my function. Feel at home.\n");
}
Example 9 - Using comments in a program
#include <stdio.h>
main()
{
// Single line comment in c source code
printf("Writing comments is very useful.\n");
/*
* Multi line comment syntax
* Comments help us to understand code later easily.
* Will you write comments while developing programs ?
*/
printf("Good luck c programmer.\n");
return 0;
}
Example 10 - using structures in c programming
#include <stdio.h>
struct programming
{
float constant;
char *pointer;
};
main()
{
struct programming variable;
char string[] = "Programming in Software Development.";
variable.constant = 1.23;
variable.pointer = string;
printf("%f\n", variable.constant);
printf("%s\n", variable.pointer);
return 0;
}
Example 11 - c program for Fibonacci series
#include <stdio.h>
main()
{
int n, first = 0, second = 1, next, c;
printf("Enter the number of terms\n");
scanf("%d",&n);
printf("First %d terms of Fibonacci series are :-\n",n);
for ( c = 0 ; c < n ; c++ )
{
if ( c <= 1 )
next = c;
else
{
next = first + second;
first = second;
second = next;
}
printf("%d\n",next);
}
return 0;
}
Example 12 - c graphics programming
#include <graphics.h>
#include <conio.h>
main()
{
int gd = DETECT, gm;
initgraph(&gd, &gm,"C:\\TC\\BGI");
outtextxy(10,20, "Graphics source code example.");
circle(200, 200, 50);
setcolor(BLUE);
line(350, 250, 450, 50);
getch();
closegraph( );
return 0;
}
For GCC users
If you are using GCC on Linux operating system then you need to modify programs. For example consider the following program which prints first ten natural numbers
#include <stdio.h>
#include <conio.h>
int main()
{
int c;
for ( c = 1 ; c <= 10 ; c++ )
printf("%d\n", c);
getch();
return 0;
}
Above source code includes a header file <conio.h> and uses function getch, but this file is Borland specific so it works in turbo c compiler but not in GCC. So the code for GCC should be like
#include <stdio.h>
int main()
{
int c;
/* for loop */
for ( c = 1 ; c <= 10 ; c++ )
printf("%d\n", c);
return 0;
}
If using GCC then save the code in a file say “numbers.c”, to compile the program open the terminal and enter command “gcc numbers.c”, this will compile the program and to execute the program enter command “./a.out”, do not use quotes while executing commands.
C programming tutorial
C program consists of functions and declarations or instructions given to the computer to perform a particular task. The process of writing a program involves designing the algorithm, a flowchart may also be drawn, and then writing the source code, after developing the program you need to test it and debug it if it does not meet the requirement. To make a program you need a text editor and a compiler. You can use any text editor of your choice and a compiler. C compiler converts source code into machine code that consists of zero and one only and directly executed on machine. An IDE or Integrated Development Environment provides a text editor, compiler, debugger etc. for developing programs or projects.Download Codeblocks IDE it provides an ideal environment for development. It can import Microsoft Visual C++ projects, extendable as it uses plug-ins, open source and cross platform.
A c program must have at least one function which is main, function consists of declaration and statements, a statement is an expression followed by a semicolon, for example a + b, printf("c program examples") are expressions and a + b; and printf("C is an easy to learn computer programming language."); are statements. To use a variable we must indicate its type whether it is an integer, float, character. C language has many built in data types and we can make our own using structures and unions. Every data type has its own size that may depend on machine for example an integer may be of 2 or 4 Bytes. Data is stored in binary form i.e. group of bits where each bit may be '0' or '1'. Keywords such as switch, case, default, register etc. are special words with predefined meaning and can't be used for other purposes. Memory can be allocated during compile time or at run time using malloc or calloc. C language has many features such as recursion, preprocessor, conditional compilation, portability, pointers, multi threading by using external libraries, dynamic memory allocation due to which it is used for making portable software programs and applications. Networking API's are available using which computer users can communicate and interact with each other, share files etc. C standard library offers functions for mathematical operations, character strings and input/output and time. The process of making programs which is known as coding requires knowledge of programming language and logic to achieve the desired output. So you should learn c programming basics and start making programs. Learning data structures such as stacks, queues, linked lists etc. using c programming provides you a greater understanding as you learn everything in detail. General belief is to go for other high level languages but it's a good idea to learn c before learning C++ or Java. C++ programming language is object oriented and it contains all the features of c language so learning c first will help you to easily learn C++ and then you can go for Java programming.
C programming books
If you are a beginner then buy anyone of first two books mentioned below and if you have previous programming experience or you know basics of c language then you can buy third one.
C hello world program
C hello world program: c programming language code to print hello world. This program prints hello world, printf library function is used to display text on screen, '\n' places cursor on the beginning of next line, stdio.h header file contains declaration of printf function. The code will work on all operating systems may be its Linux, Mac or any other and compilers. To learn a programming language you must start writing programs in it and may be your first c code while learning programming.
Hello world in C language
//C hello world example
#include <stdio.h>
int main()
{
printf("Hello world\n");
return 0;
}
Purpose of Hello world program may be to say hello to people or the users of your software or application.
C hello world program output
Add caption
Output of program:
Hello world program in c
We may store "hello world" in a character array as a string constant and then print it.
#include <stdio.h>
int main()
{
char string[] = "Hello World";
printf("%s\n", string);
return 0;
}
Don't worry if you didn't understand above code as you may not be familiar with arrays yet.
Printing hello world indefinitely
Using loop we can print "Hello World" a desired number of time or indefinitely.
#include <stdio.h>
#define TRUE 1
int main()
{
while (TRUE)
{
printf("Hello World\n");
}
return 0;
}
While loop will execute forever until it is terminated, to terminate press (Ctrl + C) in windows operating system.
C program print integer
This c program first inputs an integer and then prints it. Input is done using scanf function and number is printed on screen using printf.
C programming code
#include <stdio.h>
int main()
{
int a;
printf("Enter an integer\n");
scanf("%d", &a);
printf("Integer that you have entered is %d\n", a);
return 0;
}
Download integer program.
Output of program:
input number
In c language we have data type for different types of data, for integer data it is int, for character date char, for floating point data it's float and so on.
C program to add two numbers
C program to add two numbers: This c language program perform the basic arithmetic operation of addition on two numbers and then prints the sum on the screen. For example if the user entered two numbers as 5, 6 then 11 (5 + 6) will be printed on the screen.
C programming code
#include<stdio.h>
int main()
{
int a, b, c;
printf("Enter two numbers to add\n");
scanf("%d%d",&a,&b);
c = a + b;
printf("Sum of entered numbers = %d\n",c);
return 0;
}
Download Add numbers program executable.
Output of program:
add numbers
Addition without using third variable
#include<stdio.h>
main()
{
int a = 1, b = 2;
/* Storing result of addition in variable a */
a = a + b;
/* Not recommended because original value of a is lost
* and you may be using it somewhere in code considering it
* as it was entered by the user.
*/
printf("Sum of a and b = %d\n", a);
return 0;
}
C program to add two numbers repeatedly
#include<stdio.h>
main()
{
int a, b, c;
char ch;
while(1)
{
printf("Enter values of a and b\n");
scanf("%d%d",&a,&b);
c = a + b;
printf("a + b = %d\n", c);
printf("Do you wish to add more numbers(y/n)\n");
scanf(" %c",&ch);
if ( ch == 'y' || ch == 'Y' )
continue;
else
break;
}
return 0;
}
Adding numbers in c using function
#include<stdio.h>
long addition(long, long);
main()
{
long first, second, sum;
scanf("%ld%ld", &first, &second);
sum = addition(first, second);
printf("%ld\n", sum);
return 0;
}
long addition(long a, long b)
{
long result;
result = a + b;
return result;
}
We have used long data type as it can handle large numbers, if you want to add still larger numbers which doesn't fit in long range then use array, string or other data structure.
c program to check odd or even
c program to check odd or even: We will determine whether a number is odd or even by using different methods all are provided with a code in c language. As you have study in mathematics that in decimal number system even numbers are divisible by 2 while odd are not so we may use modulus operator(%) which returns remainder, For example 4%3 gives 1 ( remainder when four is divided by three). Even numbers are of the form 2*p and odd are of the form (2*p+1) where p is is an integer.
C program to check odd or even using modulus operator
#include<stdio.h>
main()
{
int n;
printf("Enter an integer\n");
scanf("%d",&n);
if ( n%2 == 0 )
printf("Even\n");
else
printf("Odd\n");
return 0;
}
We can use bitwise AND (&) operator to check odd or even, as an example consider binary of 7 (0111) when we perform 7 & 1 the result will be one and you may observe that the least significant bit of every odd number is 1, so ( odd_number & 1 ) will be one always and also ( even_number & 1 ) is zero.
C program to check odd or even using bitwise operator
#include<stdio.h>
main()
{
int n;
printf("Enter an integer\n");
scanf("%d",&n);
if ( n & 1 == 1 )
printf("Odd\n");
else
printf("Even\n");
return 0;
}
Find odd or even using conditional operator
#include<stdio.h>
main()
{
int n;
printf("Input an integer\n");
scanf("%d",&n);
n%2 == 0 ? printf("Even\n") : printf("Odd\n");
return 0;
}
C program to check odd or even without using bitwise or modulus operator
#include<stdio.h>
main()
{
int n;
printf("Enter an integer\n");
scanf("%d",&n);
if ( (n/2)*2 == n )
printf("Even\n");
else
printf("Odd\n");
return 0;
}
In c programming language when we divide two integers we get an integer result, For example the result of 7/3 will be 2.So we can take advantage of this and may use it to find whether the number is odd or even. Consider an integer n we can first divide by 2 and then multiply it by 2 if the result is the original number then the number is even otherwise the number is odd. For example 11/2 = 5, 5*2 = 10 ( which is not equal to eleven), now consider 12/2 = 6 and 6 *2 = 12 ( same as original number). These are some logic which may help you in finding if a number is odd or not.
C program to perform addition, subtraction, multiplication and division
C program to perform basic arithmetic operations which are addition, subtraction, multiplication and division of two numbers. Numbers are assumed to be integers and will be entered by the user.
C programming code
#include <stdio.h>
int main()
{
int first, second, add, subtract, multiply;
float divide;
printf("Enter two integers\n");
scanf("%d%d", &first, &second);
add = first + second;
subtract = first - second;
multiply = first * second;
divide = first / (float)second; //typecasting
printf("Sum = %d\n",add);
printf("Difference = %d\n",subtract);
printf("Multiplication = %d\n",multiply);
printf("Division = %.2f\n",divide);
return 0;
}
Output of program:
arithmetic operations program
In c language when we divide two integers we get integer result for example 5/2 evaluates to 2. As a general rule integer/integer = integer and float/integer = float or integer/float = float. So we convert denominator to float in our program, you may also write float in numerator. This explicit conversion is known as typecasting.
C program to check whether input alphabet is a vowel or not
This code checks whether an input alphabet is a vowel or not. Both lower-case and upper-case are checked.
C programming code
#include <stdio.h>
int main()
{
char ch;
printf("Enter a character\n");
scanf("%c", &ch);
if (ch == 'a' || ch == 'A' || ch == 'e' || ch == 'E' || ch == 'i' || ch == 'I' || ch =='o' || ch=='O' || ch == 'u' || ch == 'U')
printf("%c is a vowel.\n", ch);
else
printf("%c is not a vowel.\n", ch);
return 0;
}
Output of program:
check vowel
Check vowel using switch statement
#include <stdio.h>
int main()
{
char ch;
printf("Input a character\n");
scanf("%c", &ch);
switch(ch)
{
case 'a':
case 'A':
case 'e':
case 'E':
case 'i':
case 'I':
case 'o':
case 'O':
case 'u':
case 'U':
printf("%c is a vowel.\n", ch);
break;
default:
printf("%c is not a vowel.\n", ch);
}
return 0;
}
Function to check vowel
int check_vowel(char a)
{
if (a >= 'A' && a <= 'Z')
a = a + 'a' - 'A'; /* Converting to lower case or use a = a + 32 */
if (a == 'a' || a == 'e' || a == 'i' || a == 'o' || a == 'u')
return 1;
return 0;
}
This function can also be used to check if a character is a consonant or not, if it's not a vowel then it will be a consonant, but make sure that the character is an alphabet not a special character.
C program to check leap year
C program to check leap year: c code to check leap year, year will be entered by the user.
C programming code
#include <stdio.h>
int main()
{
int year;
printf("Enter a year to check if it is a leap year\n");
scanf("%d", &year);
if ( year%400 == 0)
printf("%d is a leap year.\n", year);
else if ( year%100 == 0)
printf("%d is not a leap year.\n", year);
else if ( year%4 == 0 )
printf("%d is a leap year.\n", year);
else
printf("%d is not a leap year.\n", year);
return 0;
}
.
Output of program:
leap year program
Please read the leap year article at Wikipedia, it will help you to understand the program. This code is based on Gregorian Calendar.
Comments
As noted above, comments do not affect the operation of the program; however, they provide an important tool to document directly within the source code what the program does and how it operates.C++ supports two ways of commenting code:
The first of them, known as line comment, discards everything from where the pair of slash signs (
//) are found up to the end of that same line. The second one, known as block comment, discards everything between the/*characters and the first appearance of the*/characters, with the possibility of including multiple lines.Let's add comments to our second program:
Hello World! I'm a C++ programIf comments are included within the source code of a program without using the comment characters combinations
//,/*or*/, the compiler takes them as if they were C++ expressions, most likely causing the compilation to fail with one, or several, error messages.