timer program to call function in c

#include<stdio.h>
#include<time.h>

int main()
{
 int a =10;
 int i=0;

 time_t seconds;
 seconds = time (NULL);
 for(;;)
 {
   for(;;)
   {
     if(time(NULL) - seconds <3)
     {
       printf("in if \n");
       foo();
       a++;
     }
     else
     {
       break;
     }
   }
   printf("%d",a);
  }
 return 0;
}