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iswupper() function in C++ STL
In this article we are going to discuss the iswupper() function in C++, its syntax, working and its return values.
iswupper() function is an inbuilt function in C++ which is defined in header file. The function checks whether the passed wide character is in upper case(A-Z) or not.This function is a wide character equivalent of isupper(), which means it works the same as isupper() the difference is it supports a wide character. The function checks the if argument passed is upper case(A-Z) then return a non-zero integer value(true), else return zero(false)
Syntax
int iswupper(wint_t ch);
The function accepts only one parameter, i.e. a wide character which is to be checked. The argument is casted in wint_t or WEOF.
wint_t stores an integral type of data.
Return value
The function returns an integer value, which can be either 0 (in case of false) or any non-zero value(in case of true).
Example
#include <iostream>
#include <cwctype>
using namespace std;
int main() {
wint_t a = 'A';
wint_t b = 'a';
wint_t c = 'B';
iswupper(a)?cout<<"\nIts upper case character":cout<<"\nNot upper case character";
iswupper(b)?cout<<"\nIts upper case character":cout<<"\nNot upper case character";
iswupper(c)?cout<<"\nIts upper case character":cout<<"\nNot upper case character";
}Output
If we run the above code it will generate the following output −
Its upper case character Not upper case character Its upper case character
Example
#include <iostream>
#include <cwctype>
using namespace std;
int main () {
int i, count;
wchar_t s[] = L"I aM VisItinG TutOriAls PoInT";
count = i = 0;
while (s[i]) {
if(iswupper(s[i]))
count++;
i++;
}
cout<<"There are "<<count <<" uppercase characters.\n";
return 0;
}Output
If we run the above code it will generate the following output −
There are 11 uppercase characters.
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