Print the given string in reverse order in C

Understanding String Reversal

Reversing a string means changing its character order from end to start.

We will explore three different methods to reverse a string in C.

Method 1: Using a Loop

This method iterates through the string from end to start and prints the characters.

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

void reverseString(char s[]) {
    int len = strlen(s);
    for (int i = len - 1; i >= 0; i--) {
        printf("%c", s[i]);
    }
    printf("\n");
}

int main() {
    char str[] = "hello";
    reverseString(str);
    return 0;
}
            

Method 2: Using Recursion

This method reverses the string using recursion.

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

void reverseRecursively(char s[], int index) {
    if (index < 0) {
        printf("\n");
        return;
    }
    printf("%c", s[index]);
    reverseRecursively(s, index - 1);
}

int main() {
    char str[] = "world";
    reverseRecursively(str, 4);
    return 0;
}
            

Method 3: Using String Reverse Function

This method uses a built-in function to reverse the string.

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

int main() {
    char s[] = "example";
    strrev(s);
    printf("%s\n", s);
    return 0;
}