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Sunday 21 July 2013

C program to copy string using pointers

Write a C program to copy string using pointers.


  #include <stdio.h>
  #include <string.h>
  #include <stdlib.h>

  int main() {
        char source[256], *dest;
        int i, len;

        /* get the input string from the user */
        printf("Enter your input string:");
        fgets(source, 256, stdin);
        source[strlen(source) - 1] = '\0';

        /* find the length of the given input string */
        len = strlen(source);

        /* dynamically allocate memory for dest string */
        dest = (char *) malloc(sizeof(char) * len);

        /* copy characters in souce string to dest string */
        for (i = 0; i <= len; i++) {
                *(dest + i) = *(source + i);
        }

        /* print the results */
        printf("Result:");
        printf("\nSource String     : %s", source);
        printf("\nDestination String: %s\n", dest);

        return 0;
  }



  Output:
  jp@jp-VirtualBox:~/$ ./a.out
  Enter your input string:strcpy
  Result:
  Source String      : strcpy
  Destination String: strcpy


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