toupper() function in c with exmaple program

 toupper() function in c programming is used to convert lowercase alphabets to uppercase letters.

When a programmer passed a lowercase alphabet to toupper() function then it converts it to uppercase.

Or when a uppercase alphabet is passed then function returns same value.

Syntax for toupper() function in c :-

int toupper(int ch);

Example Program for toupper() in c :- 

Let's go with an simple s example program to convert lower case alphabet to uppercase using toupper() function.

#include <ctype.h> 

int main() 

{ 

    char ch; 

    // letter to convert to uppercase

    ch = 'a'; 

    printf("%c in uppercase is represented as %c", 

        ch, toupper(ch)); 

    return 0; 

} 

Note :- Remember toupper() in c only takes one character at a time.

So if you want to convert a hole word then use while loop for it