hdu2131 Probability（C语言）

最新推荐文章于 2020-04-07 11:52:28 发布

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最新推荐文章于 2020-04-07 11:52:28 发布

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分类专栏：算法训练01-大学训练文章标签： ACM hdu c语言

本文链接：https://blog.youkuaiyun.com/sinat_39591298/article/details/76484874

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本文介绍了Mickey与mini玩的一个关于概率的游戏，给定一个字母和一个单词，计算字母在单词中出现的概率。例如，字母'a'在单词'apple'中出现的概率为0.20000。文章提供了C语言的AC代码实现，通过读取输入的字母和单词，计算并输出概率值。代码中使用了getchar()处理换行符，并用double类型处理概率结果，确保精度到小数点后五位。

Problem Description

Mickey is interested in probability recently. One day , he played a game which is about probability with mini.First mickey gives a letter and a word to mini.Then mini calculate the probability that the letter appears in the word.For example,give you the letter "a" and the word "apple". the probability of this case is 0.20000.

Input

The input contains several test cases. Each test case consists of a letter and a word.The length of the word is no longer than 200.

Output

For each test case, print the probability rounded to five digits after the decimal point.

Sample Input

  
   a apple
c Candy
a banana

Sample Output

Author

KiKi

Source

HDU 2007-11 Programming Contest_WarmUp

C语言AC代码

#include<stdio.h>
#include<string.h>
int main()
{
    double r;
    int s,i,l;
    char a[205],n;
    while(scanf("%c%s",&n,a)!=EOF)
    {
        getchar();
        l=strlen(a);
        s=0;
        r=0;
        for(i=0;i<l;i++)
        {
            if(a[i]==n)
                s=s+1;
            if((a[i]+32)==n)
                s=s+1;
            if((a[i]-32)==n)
                s=s+1;
        }
        r=s*1.0/l;
        printf("%.5lf\n",r);
    }
    return 0;
}

注意：getchar吃换行符，double要用lf，细节，mmp