Whenever I try to use srand function I get this warning 

"implicit declaration of function 'time' [-Wimplicit-function-declaration]|"

and a windows error report appears when running the compiled file,
I'm a novice to c programming, I found this on a text book, but it doesn't work for me. 

  srand (time());  
  int x= (rand()%10) +1;  
  int y= (rand()%10) +1;  
  printf("\nx=%d,y=%d", x,y);

What do I need to correct this?

c srand
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