题解 | #计算某字符出现次数#

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

int main()
{
  
    string s;
    getline( cin, s);
    
    char ch;
    cin >> ch;
    int count = 0;
    
    for( int i = 0; i < s.length(); i++)
    {
        if( s[i] >= 'A' && s[i] <= 'Z')
        {
            if (s[i] == ch || s[i] == ch-32)
            {
                count++;
            }
        }
        else if(s[i] >= 'a' && s[i] <= 'z')
        {
            if (s[i] == ch || s[i] == ch+32)
            {
                count++;
            }
        }
        else if(s[i] == ch)
        {
            count++;
        }
    }
    
    cout << count << endl;
    
    return 0;
}