Reversing a String

Implementation of reversing a string without using library function.

Procedure :

• Calculate the length of string if it isn't given as input.

• Initialise i with 0 and j with length - 1.

• Run a for loop till i < j.

• Swap the i-th and j-th character in each iteration.

C Function :

void reverse(char a[], int n) {

    // Initialise i with 0 and j with length - 1
    int i = 0, j = n-1;
    char temp;

    // Swap characters in each iteration
    for (i = 0, j = n-1; i < j; i++, j--) {
        temp = a[i];
        a[i] = a[j];
        a[j] = temp;
    }
    
}

Contributed by Nitin Ranganath