C Program to Reverse the String using Both Recursion and Iteration

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This C Program reverse the string using both recursion and iteration.

Here is source code of the C Program to reverse the string using both recursion and iteration. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

  1. /*
  2.  *  C Program to Reverse the String using Both Recursion and Iteration
  3.  */
  4. #include <stdio.h>
  5. #include <string.h>
  6.  
  7. /* Function Prototype */
  8. void disp_str1_rec(char *);
  9.  
  10. void main()
  11. {
  12.     char str1[100], *ptr;
  13.     int len1 = 0, i;
  14.     char ch;
  15.     printf("Enter the string:\n");
  16.     scanf("%[^\n]s", str1);
  17.     ptr = str1;
  18.     len1 = strlen(str1);
  19.     printf("Using iteration:\n");
  20.     for (i = len1 - 1; i >= 0;i--)        /* Iterative loop */
  21.     {
  22.  
  23.         ch = str1[i];
  24.         printf("%c", ch);
  25.     }
  26.     printf("Using recurssion:\n");
  27.     disp_str1_rec(ptr);
  28. }
  29.  
  30. /* Code to reverse the string using Recursion */
  31. void disp_str1_rec(char *stng)
  32. {
  33.     char ch;
  34.     if (*stng != '\0')
  35.     {
  36.         ch = *stng;
  37.         stng++;
  38.         disp_str1_rec(stng);
  39.         printf("%c", ch);
  40.     }
  41.     else
  42.     return;
  43. }

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$ cc string21.c
$ a.out
Enter the string:
welcome to sanfoundry's c programming class
 
Using iteration:
ssalc gnimmargorp c s'yrdnuofnas ot emoclew
Using recurssion:
ssalc gnimmargorp c s'yrdnuofnas ot emoclewi

Sanfoundry Global Education & Learning Series – 1000 C Programs.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn | Youtube | Instagram | Facebook | Twitter