C library functions -toupper()

Description

C Library Functionsint toupper(int c)Convert lowercase letters to uppercase letters.

Declaration

Below is the declaration of the toupper() function.

int toupper(int c);

Parameter

c-- This is the letter to be converted to uppercase.

Return Value

If c has a corresponding uppercase letter, the function returns the uppercase letter of c; otherwise, c remains unchanged. The return value is an int value that can be implicitly converted to type char.

Example

The following example demonstrates the usage of the toupper() function.

#include <stdio.h>
#include <ctype.h>

int main()
{
   int i = 0;
   char c;
   char str[] = "example";
   
   while(str[i])
   {
      putchar (toupper(str[i]));
      i++;
   }
   
  return(0);
}

Let us compile and run the above program, which will produce the following result:

EXAMPLE

C Standard Library - <ctype.h>

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