hdu 2131 Probability

#include<iostream>#include<cstring>using namespace std;int main(){char str[300],ch;int cnt;int i;int k;while(cin>>ch>>str){k=strlen(str);cnt=0;for(i=0;i<=k-1;i++){if(ch==str[i]||ch==str[i]-32||ch==str[i]+32){cnt++;}}printf("%.5lf\n",1.0*cnt/k);}return 0;}

<pre name="code" class="cpp">#include<string.h>#include<stdio.h>int main(){char str[300],ch;int cnt;int i;int k;memset(str,0,sizeof(str));while(scanf("%c",&ch)!=EOF){getchar();gets(str);k=strlen(str);cnt=0;for(i=0;i<=k-1;i++){if(ch==str[i]||ch==str[i]-32||ch==str[i]+32){cnt++;}}printf("%.5lf\n",1.0*cnt/k);memset(str,0,sizeof(str));}return 0;}