怎么那么复杂的?
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#include<stdio.h>

#define pi 3.14159

int main(){
	int number;
	int k=1;
	scanf("%d", &number);
	while(number>0){
		float i,j;
		scanf("%f %f", &i, &j);
		printf("Property %d: This property will begin eroding in year %d.\n", k, (int)(pi*(i*i+j*j)/100)+1);
		number--;k++;
	}
	printf("END OF OUTPUT.\n");
}