UVA 11461.Square Numbers

 

11461 - Square Numbers

Time limit: 1.000 seconds 

A square number is an integer number whose square root is also an integer. For example 1, 4, 81 are some square numbers. Given two numbers a and b you will have to find out how many square numbers are there between a and b (inclusive).
Input

The input file contains at most 201 lines of inputs. Each line contains two integers a and b (0 < a ≤ b ≤ 100000). Input is terminated by a line containing two zeroes. This line should not be processed.
Output
For each line of input produce one line of output. This line contains an integer which denotes how many square numbers are there between a and b (inclusive).
Sample Input
1 4

1 10

0 0
Sample Output
2

3

题意就是a-b(包括a,b)的范围内有多少个平方数。

代码:

#include<stdio.h>
#include<math.h>
int main(){
    int n,m,ans,cnt,i;
    while(~scanf("%d%d",&n,&m)){
        if(n==0&&m==0)break;
        ans=0;
        for(i=n;i<=m;i++){
            cnt=sqrt(i);
        if(cnt*cnt==i)
            ans++;
        }
        printf("%d
",ans);
    }
    return 0;
}