isupper function >> ctype.h >> header files in c Programming
Syntax int isupper (int c)
Header Filectype.h
Return Value
  • Return non-zero if c is  Uppercase Letter
  • Return zero if c is not Uppercase Letter
Live Example :
void main()
{
char ch = 'A';

if( isupper(ch))
       printf("nThis is Uppercase Character");
else
       printf("nThis is not an Uppercase Character");
}
Output : 
This is Uppercase Character
Explanation of statement : if(isupper(ch))
  1. character ch is passed to function isupper
  2. if ch belongs to the set of Uppercase Characters [A-Z] then it returns non-zero value 
  3. otherwise it returns zero .
Note : 
  1. Positive non-zero value given to if block , will result in TRUE condition
  2. Zero value given to if block , will result in FALSE condition
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