题解 | #计算某字符出现次数#

#include <iostream>
#include <string>
using namespace std;

int main() {
    string s;
    char c;
    int count=0;
    getline(cin,s);
    cin>>c;
    if((c>='a' && c<='z') || (c>='A' && c<='Z')){
        char c2;
        if(c>='a' && c<='z'){
            c2='A'+(c-'a');
        }else{
            c2='a'+(c-'A');
        }
        for(int i=0;i<s.size();i++){
            if(s[i]==c || s[i]==c2){
                count++;
            }
        }
    }else{
        for(int i=0;i<s.size();i++){
            if(s[i]==c){
                count++;
            }
        }
    }
    cout<<count<<endl;
    return 0;
}