HDU1701 ACMer 【浮点数误差】

ACMer

Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)

Total Submission(s): 3536    Accepted Submission(s): 1629

Problem Description

There are at least P% and at most Q% students of HDU are ACMers, now I want to know how many students HDU have at least?

 

Input

The input contains multiple test cases.
The first line has one integer,represent the number of test cases.
The following N lines each line contains two numbers P and Q(P < Q),which accurate up to 2 decimal places.

 

Output

For each test case, output the minumal number of students in HDU.

 

Sample Input

   
   
   
   

    
    
    
    1
13.00 14.10
   
   
   
   

 

Sample Output

   
   
   
   

    
    
    
    15
   
   
   
   

这题应该分类到“经典题”还是“烂题”呢？这个真的不好说，WA了2次。精度问题，精度问题。。

AC代码：

#include <stdio.h>

int main(){
	int n, m; double a, b;
	scanf("%d", &n);
	while(n--){
		scanf("%lf%lf", &a, &b);
		m = 1;
		while((int)(m * a / 100) >= (int)(m * b / 100)) ++m;
		printf("%d\n", m);
	}
	return 0;
}

WA代码：

#include <stdio.h>

int main(){
	int n, m; double a, b;
	scanf("%d", &n);
	while(n--){
		scanf("%lf%lf", &a, &b);
		a /= 100; b /= 100;
		m = 1;
		while((int)(m * a) >= (int)(m * b)) ++m;
		printf("%d\n", m);
	}
	return 0;
}