How to Reverse a String in C - Step by Step Examples

How to Reverse a String in C ?

Answer

To reverse a string in C, you can iterate over half of the string swapping characters from the beginning and the end of the string.

✐ Examples

1 Reversing "Hello World" String

In this example,

We create a string array named str1 with a value of "Hello World\0".
We find the length of str1 using strlen().
We iterate from i=0 to len/2 and swap str1[i] with str1[len-1-i].
Finally, we print the reversed string.

C Program

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

int main() {
    char str1[] = "Hello World\0";
    int len = strlen(str1);
    for (int i = 0; i < len / 2; i++) {
        char temp = str1[i];
        str1[i] = str1[len - 1 - i];
        str1[len - 1 - i] = temp;
    }
    printf("Reversed string is: %s", str1);
    return 0;
}

Output

Reversed string is: dlroW olleH

2 Reversing "apple" String

In this example,

We create a string array named str2 with a value of "apple\0".
We find the length of str2 using strlen().
We iterate from i=0 to len/2 and swap str2[i] with str2[len-1-i].
Finally, we print the reversed string.

C Program

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

int main() {
    char str2[] = "apple\0";
    int len = strlen(str2);
    for (int i = 0; i < len / 2; i++) {
        char temp = str2[i];
        str2[i] = str2[len - 1 - i];
        str2[len - 1 - i] = temp;
    }
    printf("Reversed string is: %s", str2);
    return 0;
}

Output

Reversed string is: elppa

Summary

In this tutorial, we learned How to Reverse a String in C language with well detailed examples.

◀ Previous Next ▶

C Tutorials

C How-Tos

How to Reverse a String in C - Step by Step Examples

How to Reverse a String in C ?

Answer

✐ Examples

1 Reversing "Hello World" String

C Program

Output

2 Reversing "apple" String

C Program

Output

Summary

More C Strings Tutorials