C - toupper function

Synopsis:

#include <stdio.h>

int toupper(int c);

Description:

The function returns the corresponding uppercase letter if one exists and if islower(c); otherwise, it returns c.

Return Value

The function returns the corresponding uppercase letter if one exists and if islower(c); otherwise, it returns c.

Example

#include <stdio.h>
int main() {

  printf( "Upper case of a is %c\n", toupper('a'));
  printf( "Upper case of 9 is %c\n", toupper('9'));
  printf( "Upper case of g is %c\n", toupper('g'));
  return 0;
}

It will proiduce following result:

Upper case of a is A
Upper case of 9 is 9
Upper case of g is G

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