题解 | 首字母大写

#include<bits/stdc++.h>
using namespace std;

//判断是否为小写字母
bool issmall(char a)
{
    if(a>='a'&&a<='z')
    {
        return true;
    }
    return false;
}

char stob(char a)
{
    return a-'a'+'A';
}

int main()
{
    string str;
    while(getline(cin,str))
    {
        int len = str.length();
        int i = 0;
        if(issmall(str[i]))
        {
            str[i] = stob(str[i]);
        }
        for(int i = 0;i<len;i++)
        {
            if((str[i] == ' '||str[i]=='\t'||str[i]=='\r'||str[i]=='\n') && issmall(str[i+1]))
            {
                str[i+1] = stob(str[i+1]);
            }
        }
        cout<<str<<endl;
    }
    return 0;
}