01  #include<stdio.h>
02  #include<string.h>
03  
04  int main()
05  {
06   char *str = "International company", *sub = "nation", *ptr;
07  
08   ptr = strstr(str, sub);
09   printf("The substring is: %sn", ptr);
10   
11   return 0;
12  }

 OUTPUT :
 
 The substring is : national company