Search an element in an array

#include<stdio.h>

void main() {

   int a[30], ch, num, i;

   printf("\nEnter no of elements :");

   scanf("%d", &num);

   printf("\nEnter the values :");

   for (i = 0; i < num; i++) {

      scanf("%d", &a[i]);

   }

   //Read the element to be searched

   printf("\nEnter the elements to be searched :");

   scanf("%d", &ch);

   //Search starts from the zeroth location

   i = 0;

   while (i < num && ch != a[i]) {

      i++;

   }

   //If i < num then Match found

   if (i < num) {

      printf("Number found at the location = %d", i + 1);

   } else {

      printf("Number not found");

   }