Question

How to swap two characters in array of characters in C

Answer 1

#include <stdio.h>
 
void swap(char arr[], int i, int j);

int main(void)
{
    char arr[10] = {'a', 'b', 'c', 'd', 'e'};
                  // 0    1    2    3    4
    swap(arr, 2, 3);
    
    putchar(arr[2]);
    putchar('\n');
    putchar(arr[3]);
    
    return 0;
}

void swap(char arr[], int i, int j) 
{ 
    char tmp; 

    tmp = arr[i]; 
    arr[i] = arr[j]; 
    arr[j] = tmp; 
}

/*
run:
 
d
c

*/

 

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