isupper example in C

Header file:

    ctype.h

Synopsis:

    int isupper (int c)   

Description:

    Checks whether the given input is an uppercase character or not.

Return Value:

    TRUE(non-zero) on success

    0 on failure

isupper function C example

  #include<stdio.h>
  #include<ctype.h>
  int main() {
        char a;
        printf("Enter a character:");
        a = getchar();
        if(isupper(a))
                printf("The given character is in upper case\n");
        else
                printf("The given character is not in upper case\n");
        printf("Return value from isupper:%d\n", isupper(a));
        return 0;
  }

  Output:

  Enter a character:A
  The given character is in upper case
  Return value from isupper:256