Sub-sting in Main string

Aim:
To find sub-string in a given string.

Program:
#include<stdio.h>
#include<conio.h>
void main ( )
{
   int count=0,count2=0,i,j,flag;
   char str[80],search[20];
clrscr();
printf("\n Enter a string:");
gets(str);
printf("\n Enter a sub-string:");
gets(search);
  while( str[count] != '\0')
    count++;
  while( search[count2] != '\0')
    count2++;
for(i=0;i<=count1-count2;i++)
  {
    for(j=i;j<i+count2;j++)
      {
        flag =1;
        if( str[i] != search[j-i] )
          {
            flag = 0;
            break;
          }
      }
  if( flag == 1)
      break;
}
  if( flag == 1)
printf("\n SEARCH SUCCESSFUL");
  else
printf("\n SEARCH NOT SUCCESSFUL");
}