#include <stdio.h>
#include <stdlib.h>

void swap(char arr[], int a, int b)
{
     if(a != -1 && b != -1) 
     {
          char temp = arr[a];
          arr[a] = arr[b];
          arr[b] = temp;
     }
}

int getIndex(char arr[], int arr_size, char val)
{
    int i=0;
    for(i=0; i<arr_size; i++)
    {
             if(arr[i] == val) return i;
    }
    
    return -1;
}

int main()
{
    char c[5] = {'a', 'b', 'c', 'e', 'f'};
    int i=0;
    
    printf("'e' is at index %d\n", getIndex(c, 5, 'e'));
    swap(c, getIndex(c, 5, 'e'), getIndex(c, 5, 'a'));
    printf("'e' is now at %d\n", getIndex(c, 5, 'e'));
    
    for(i=0; i<5; i++)
    {
        printf("%c ", c[i]);
    }
    printf("\n");
    system("pause");
}