题解 | #计算某字符出现次数#

#include <iostream>
using namespace std;

int main() {
    string str;
    char a,b;
    int count =0;
    getline(cin,str);
    int n=str.size();
    cin>>a;
    b=a;
    if(('A'<=a)&&(a<='Z'))
      b=a+32;
    else if(('a'<=a)&&(a<='z'))
       b=a-32;
    for(int i=0;i<n;i++)
    {
        if((a == str[i])||(b == str [i]))
           count++;
    }
    cout<< count<<endl;
}
// 64 位输出请用 printf("%lld")