C Program to Reverse a String using Recursion and Iteration

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.

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/*
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 *  C Program to Reverse the String using Both Recursion and Iteration

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 */
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#include <stdio.h>
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```
#include <string.h>
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```
 
```
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/* Function Prototype */
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void disp_str1_rec(char *);
```
```
 
```
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void main()
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{
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    char str1[100], *ptr;
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    int len1 = 0, i;
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    char ch;
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    printf("Enter the string:\n");
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    scanf("%[^\n]s", str1);
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    ptr = str1;
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    len1 = strlen(str1);
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    printf("Using iteration:\n");
```

    for (i = len1 - 1; i >= 0;i--)        /* Iterative loop */

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    {
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        ch = str1[i];
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        printf("%c", ch);
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    }
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    printf("Using recurssion:\n");
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    disp_str1_rec(ptr);
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}
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```
 
```

/* Code to reverse the string using Recursion */

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void disp_str1_rec(char *stng)
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```
{
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    char ch;
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    if (*stng != '\0')
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    {
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        ch = *stng;
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        stng++;
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        disp_str1_rec(stng);
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        printf("%c", ch);
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    }
```
```
    else
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    return;
```
```
}
```

$ 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

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