csu 1742 Integral Function（分区间求积分）

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Integral Function

Time Limit: 1 Sec Memory Limit: 128 MB
Submit: 78 Solved: 26
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Description

In mathematics, several function are unable to integral. For example:

But you can get the answer by computer.

Input

There are no more than T (T<=30) cases. Each case include two integer a, b (0<a <= b<=10).

Output

Each case output an answer.

(Please output the answer by ‘‘ printf (“%d\n”,(int)(answer*10000)) ‘‘ ).

Sample Input

1 11 22 8

Sample Output

06593-312

题意：求

思路：这是个典型的不可积函数，然后观察发现a和b都比较小，那么我们分区间，把所有矩形加起来即可得到近似值

代码：

#include <iostream>#include <cstdio>#include <cstring>#include <algorithm>#include <cmath>using namespace std;int main(){    double a,b;    while(~scanf("%lf %lf",&a,&b))    {        if(a==b)        {            printf("0\n");            continue;        }        double ans=0.0,d=(b-a)/100000;        while(a<=b)        {            ans=ans+sin(a)/a*d;            a+=d;        }        printf("%d\n",(int)(ans*10000));    }    return 0;}

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