text: #include<stdio.h>
  #define SEC_PER_MIN 60
  int main(void)
  {
  	int sec, min, left;
  
  	printf("Convert seconds to minutes and seconds!\n");
  	printf("Enter the number of seconds (<=0 to quit):\n");
  	scanf("%d", &sec);
  	while(sec > 0)
  	{
  		min = sec / SEC_PER_MIN;
  		left = sec % SEC_PER_MIN;
  		printf("%d seconds is %d minutes, %d seconds.\n", sec,
  				min, left);
  		printf("Enter next value (<=0 to quit):\n");
  		scanf("%d", &sec);
  	}
  	printf("Done!\n");
  
  	return 0;
  }
  