task5.c

include <stdio.h>

include<math.h>

int main()

{

double year;

int sec;

int time;

sec = 1000000000;
time = 30758400;
year = sec / time;
year = (int)round(sec / time);

	printf("10亿秒约等于%lf年\n", year);
return 0;

}