题解 | #计算某字符出现次数#

#include <iostream>
using namespace std;

int main() {
    string s;
    char asc;
    getline(cin,s);
    cin>>asc;
    int bsc = asc;
    int i = 0;
    int count = 0;
    if(bsc < 60){ 
        while(s[i] != '\0'){
            if(s[i] == asc){
                count++;
            }
            i++;
        }
    }
    else if( bsc< 91){ 
        int csc = bsc + 32;
        char Asc = csc;
        while(s[i] != '\0'){
            if(s[i] == asc || s[i] == Asc){
                count++;
            }
            i++;
        }
    }
    else{
        int csc = bsc -32;
        char Asc = csc;
        while(s[i] != '\0'){
            if(s[i] == asc || s[i] == Asc){
                count++;
            }
            i++;
        }
    }
    cout<< count <<endl;
    
}
// 64 位输出请用 printf("%lld")

易错点：

1. in不能判断输入空格，要用getline