STRLWR() and STRUPR() in C Programming | Convert String into LOWERCASE and UPPERCASE in C

This is how to use strlwr() and strupr() function to convert string to lowercase or uppercase in c programming language.

#Clanguage #Cprogramming #Ctutorials

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[sravaniuppala]

#include<stdio.h>
#include<string.h>
int main()
{
Char s[10];
scanf("%s", s);
Printf("%s", strlwr(s));
return 0;
}
By running this program in online c compiler why I am getting error?

[kurt_]

#include <stdio.h>
#include <string.h>
int main()
{
char s[10];
scanf("%s", s);
printf("%s", strlwr(s));
return 0;
}
By running this program in online c compiler why I am getting error?