709. To Lower Case

Question 709

https://leetcode.com/problems/to-lower-case/description/

Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase.

Example 1:

Input: "Hello"
Output: "hello"

Example 2:

Input: "here"
Output: "here"

Example 3:

Input: "LOVELY"
Output: "lovely"

Answer By C

char* toLowerCase(char* str) {
    int i = 0;
    while(str[i]){
        if(str[i] >= 'A' && str[i] <= 'Z'){
            str[i] += 'a' - 'A';
        }
        i++;
    }
    return str;
}