Question

How to swap pairs of characters in a string with C

Answer 1

#include <stdio.h>

void SwapPairs(char str[], int size) {
    if (str[0] == '\0')
        return;

    for (int i = 0; i < size - 1; i += 2) {
        char tmp = str[i];
        str[i] = str[i + 1];
        str[i + 1] = tmp;
    }
}

int main(void)
{
    char str[] ="aBcDeFgHiJkL"; 

    int size = sizeof(str) / sizeof(str[0]);

    SwapPairs(str, size);

    puts(str);

    return 0;
}




/*
run:

BaDcFeHgJiLk

*/

 

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