C Program to Find index of Array

cArray.c

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

int main()
{
    char a[]={'a','b','c','d'};
    int i,p,c=0;
    char num;
    int n=sizeof(a)/sizeof(a[0]);

    printf("Enter a character :\n");
    scanf("%c",&num);

    for(i=0;i<n;i++)
    {

        if(a[i]==num)
        {
            p=i;
            printf("Element index is %d",p);
            c=1;
            break;
        }
        else
        {
            c=0;
        }

        if(c==0)
        {
            //printf("Number is not in Array: \n");


        }

    }
}