How do you rotate a string using C programming?

Answer 1

To rotate a string in C, you can create a function that takes the string and the number of positions to rotate as input. Use the modulo operator to handle rotations larger than the string length. You can then concatenate the two parts of the string: the substring from the rotation point to the end and the substring from the start to the rotation point. Finally, copy the result back into the original string. Here’s a basic example:

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

void rotateString(char *str, int positions) {
    int len = strlen(str);
    positions = positions % len; // Handle larger rotations
    char temp[len + 1]; // Temporary storage
    strcpy(temp, str + positions); // Copy from rotation point
    strncat(temp, str, positions); // Append the start part
    strcpy(str, temp); // Copy back to original string
}