🔁 Reverse String Using strrev() and Manually in C

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🔁 Reverse a String in C Using strrev() and Without Function

In this tutorial, you’ll learn how to reverse a string using the built-in strrev() function and also manually without using any function. Let's explore both methods.

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✅ Method 1: Using strrev() Function

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

int main() {
    char str[100];

    printf("Enter a string: ");
    gets(str);  // Use fgets() in modern C

    strrev(str);  // Built-in function (Turbo C)

    printf("Reversed string: %s\n", str);

    return 0;
}

🧠 Explanation:

• strrev() reverses the string in-place.
• gets() is used here for simplicity, but is unsafe. Prefer fgets() in modern compilers.

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🛠️ Method 2: Without Using Any Function

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

int main() {
    char str[100], temp;
    int start = 0, end;

    printf("Enter a string: ");
    fgets(str, sizeof(str), stdin);

    end = strlen(str) - 1;

    // Remove newline if present
    if (str[end] == '\n') {
        str[end] = '\0';
        end--;
    }

    while (start < end) {
        temp = str[start];
        str[start] = str[end];
        str[end] = temp;
        start++;
        end--;
    }

    printf("Reversed string: %s\n", str);

    return 0;
}

🧠 Explanation:

• This method uses index-based character swapping to reverse the string manually.
• Works in any standard C compiler (no external functions used).

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📌 Summary

strrev() is useful in compilers that support it (like Turbo C), but writing your own reverse logic ensures compatibility across all platforms. It's also a great exercise in learning character arrays and loops!

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