题解 | 计算某字符出现次数

#include <cstdio>
#include <iostream>
#include <cstring>
using namespace std;

int main() {
    char s[1000];
    char a;
    int i = 0;
    while(a!='\n'){
        a = getchar();
        s[i] = a;
        i++;   
    };
    char c = getchar();
    int count = 0;
    int asc = 'a'-'A';
    if('0'<=c&&c<='9'){
        for(int k = 0;k<i-1;k++){
            if(c==s[k])count++;
        }
    }else if ('a'<=c&&c<='z') {
        for(int k = 0;k<i-1;k++){
            if(c==s[k]||c==s[k]+asc)count++;
        }
    }else if ('A'<=c&&c<='Z'){
        for(int k = 0;k<i-1;k++){
            if(c==s[k]||c==s[k]-asc)count++;
        }
    }
    cout<<count;
    return 0;
}