strrev() in C

 Imagine you have a word written forward, like "hello".

 Now, if you want to flip it backward to say "olleh", you'd use strrev().

 Essentially, it helps reverse a string, changing its order from the last character to the first.

 strrev() is the function responsible for reversing a string.

 It takes a string str as input and reverses its characters in place.

 After applying strrev(), the original string str is transformed into its reverse form.

Example:

// Program for strrev function in c
#include<stdio.h> 
#include<string.h> 

// Function to reverse a string
void strrev(char *str) {
    int length = strlen(str); // Find the length of the string
    int start = 0; // Start index of the string
    int end = length - 1; // End index of the string

    // Swap characters from start and end of the string
    while (start < end) {
        // Swap characters
        char temp = str[start];
        str[start] = str[end];
        str[end] = temp;

        // Move start index forward and end index backward
        start++;
        end--;
    }
}

int main() {
    char str[] = "hello"; // Input string
    
    printf("Original string: %s\n", str); // Print original string
    strrev(str); // Reverse the string
    printf("Reversed string: %s\n", str); // Print reversed string

    return 0;
}

Output:

Original string: hello
Reversed string: olleh

Advantage of strrev() in C 

Simple Reversal: strrev() provides an easy way to reverse a string without needing complex logic.

 Efficiency: It quickly rearranges the characters, saving time and effort.

 Versatility: You can use strrev() on any string, regardless of its length or content.

 Standard Function: strrev() is a standard function in C, widely used and understood by programmers.