Luogu brush questions C++ language | P5733 Automatic correction

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【Description】

Everyone knows that some office software has the function of automatically converting letters to uppercase. Enter a string of length 100 or less and does not include spaces. All lowercase letters in the string are required to be changed to uppercase and output.

【enter】

Enter a line, a string.

【Output】

Output a string that converts all lowercase letters in the original string to uppercase letters.

【Input example】

Luogu4!

【Example of output】

LUOGU4!

【Code Explanation】

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

int main()
{
    string s;
    cin >> s;
    for (int i=0; i<s.length(); i++) {
        if (s[i]<='z' && s[i]>='a') {
            //小写转大写
            s[i] = s[i] - 'a' + 'A';
        }
    }
    cout << s;
    return 0;
}

【operation result】

Luogu4!
LUOGU4!