Reverse a String In-Place

Code

#include <stdio.h>

void reverse_string(char *str) {
    // Your logic here
    int l = 0;
    for(l = 0; str[l]; l++);

    for(int i = l-1, j = 0; i>j; i--, j++) {
        
        str[i] ^= str[j] ^= str[i] ^= str[j];
        
        // str[i] = str[i] + str[j];
        // str[j] = str[i] - str[j];
        // str[i] = str[i] - str[j];
    }
}

int main() {
    char str[101];
    fgets(str, sizeof(str), stdin);

    // Remove newline
    int i = 0;
    while (str[i] != '\0') {
        if (str[i] == '\n') {
            str[i] = '\0';
            break;
        }
        i++;
    }

    reverse_string(str);
    printf("%s", str);
    return 0;
}

Solving Approach

void reverse_string(char *str) {
    // Your logic here
    int l = 0;
    for(l = 0; str[l]; l++);

    for(int i = l-1, j = 0; i>j; i--, j++) {
        
        str[i] ^= str[j] ^= str[i] ^= str[j];
        
        // str[i] = str[i] + str[j];
        // str[j] = str[i] - str[j];
        // str[i] = str[i] - str[j];
    }
}