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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 Add digits Factorial HCF and LCM Decimal to binary conversion ncR and nPr Add n numbers Swapping Reverse number Palindrome number Print Pattern Diamond Prime numbers Find armstrong number Generate armstrong number Fibonacci series Print floyd's triangle Print pascal triangle Addition using pointers Maximum element in array Minimum element in array Linear search Binary search Reverse array Insert element in array Delete element from array Merge arrays Bubble sort Insertion sort Selection sort Add matrices Subtract matrices Transpose matrix Multiply two matrices Print string String length Compare strings Copy string Concatenate strings Reverse string Find palindrome Delete vowels C substring Sort a string Remove spaces Change case Swap strings Character's frequency Anagrams Read file Copy files Merge two files List files in a directory Delete file Random numbers Add complex numbers Print date Get IP address Shutdown computer

c program examples

Example 1 - C hello world program /* A very simple c program printing a string on screen*/


 * 1) include   main {    printf("Hello World\n");    return 0; }

Output of above program: "Hello World"

Example 2 - c program to take input from user using scanf


 * 1) include   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


 * 1) include   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


 * 1) include   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


 * 1) include   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


 * 1) include   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


 * 1) include   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


 * 1) include   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


 * 1) include   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


 * 1) include   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


 * 1) include   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


 * 1) include  #include   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


 * 1) include  #include   int main {    int c;      for ( c = 1 ; c <= 10 ; c++ )        printf("%d\n", c);      getch;    return 0; }

Above source code includes a header file  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


 * 1) 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.

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 doesn't 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 which consists of zero and one only and can be 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 which provides an ideal environment for development. It can import Microsoft Visual C++ projects, extendable as it uses plugins, open source and cross platform.

A c program must have at least one function which is main. A 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's an integer, float, character. C language has many built in data types and we can make our own using structures and unions. 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. 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.

Let Us C By Yashavant kanetkar PROGRAMMING WITH C By Byron Gottfried, Jitender Chhabra The C Programming By Brian Kernighan and Dennis Ritchie

C programming PDF downloads and other software Dev c++ software C handbook Essential c

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