std::wcsncmp

Header: <cwchar>

Compares at most count wide characters of two null-terminated wide strings. The comparison is done lexicographically.

# Declarations

int wcsncmp( const wchar_t* lhs, const wchar_t* rhs, std::size_t count );

# Parameters

lhs, rhs: pointers to the null-terminated wide strings to compare
count: maximum number of characters to compare

# Return value

Negative value if lhs appears before rhs in lexicographical order.

# Example

#include <clocale>
#include <cwchar>
#include <iostream>
#include <locale>
 
void demo(const wchar_t* lhs, const wchar_t* rhs, int sz)
{
    int rc = std::wcsncmp(lhs, rhs, sz);
    if (rc == 0)
        std::wcout << "First " << sz << " characters of ["
                   << lhs << "] equal [" << rhs << "]\n";
    else if (rc < 0)
        std::wcout << "First " << sz << " characters of ["
                   << lhs << "] precede [" << rhs << "]\n";
    else if (rc > 0)
        std::wcout << "First " << sz << " characters of ["
                   << lhs << "] follow [" << rhs << "]\n";
}
 
int main()
{
    const wchar_t str1[] = L"안녕하세요";
    const wchar_t str2[] = L"안녕히 가십시오";
 
    std::setlocale(LC_ALL, "en_US.utf8");
    std::wcout.imbue(std::locale("en_US.utf8"));
    demo(str1, str2, 5);
    demo(str2, str1, 8);
    demo(str1, str2, 2);
}