how do you use tolower()

hello, I have a character array with a string in it and it has an uppercase letter, I'm trying to convert it to all lowercase letters, I heard that the function tolower can be used, i put the ctype.h header in but i can't get it to turn my capital letter to a lower case letter

could anyone tell me what am I doing wrong, here is my code, it's pretty simple

thank you

Code:

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

main() {
     
char word[] = "Hello";
int n = 0;

printf(" %s \n ", word);

while ( n <= 3 ){
     
      tolower( word[n]);
      n++; }
     
      printf(" %s \n ", word);

getchar();}

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tolower() can't store the modified character so you have to call it like:

Code:

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word[n] = tolower( word[n] );

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tolower() returns the converted letter. You have to write the returned value into your array word.

For tolower() you should include <ctype.h>.