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Fred Mapper is considering purchasing some land in Louisiana to build his house on. In the process of investigating the land, he learned that the state of Louisiana is actually shrinking by 50 square miles each year, due to erosion caused by the Mississippi River. Since Fred is hoping to live in this house the rest of his life, he needs to know if his land is going to be lost to erosion.
After doing more research, Fred has learned that the land that is being lost forms a semicircle. This semicircle is part of a circle centered at (0,0), with the line that bisects the circle being the X axis. Locations below the X axis are in the water. The semicircle has an area of 0 at the beginning of year 1. (Semicircle illustrated in the Figure.)
2 1.0 1.0 25.0 0.0
Property 1: This property will begin eroding in year 1. Property 2: This property will begin eroding in year 20. END OF OUTPUT.
/* 半圆形侵蚀,每年会侵蚀50 算多少年后会把这个半圆形给侵蚀掉 */ #include <stdio.h> #define PI 3.1415 int main() { double x,y,sum; int time; scanf("%d",&time); for(int i=0;i<time;i++) { //scanf("%f%f",&x,&y);//这个是不可以的 scanf("%lf%lf",&x,&y); sum = PI* (x*x + y*y)/2; int year = 0; double lost = 0.0; while(lost < sum) { lost += 50; year +=1; } printf("Property %d: This property will begin eroding in year %d.\n",i+1,year); } printf("END OF OUTPUT.\n");//别忘了 return 0; }