#include <stdio.h>

int main(void) {
      double pi = 3.1415926;
        
        printf("f\t %f\n", pi);
        //%f   3.141593

        printf(".5f\t %.5f\n", pi);
        //%.5f  3.14159

        printf(".3f\t %.3f\n", pi);
        //%.3f  3.142

        printf(".0f\t %.0f\n", pi);
        //%.0f  3
	return 0;
}