wcsncmp() function in C/C++
The wcsncmp() function in C/C++ compare characters of two wide strings. The comparison is done lexicographically. This function takes three arguments lhs, rhs and count. It compares the contents of lhs and rhs lexicographically upto a maximum of count wide characters.
Note: The behaviour of wcsncmp() is undefined if either of lhs or rhs do not point to null terminated wide strings.
Syntax:
int wcsncmp( const wchar_t* lhs, const wchar_t* rhs, size_t count )
Parameter :The function accepts three mandatory parameters which are described below:
- lhs : String to be compared
- rhs : String to be compared
- count : Maximum number of characters to compare
Return value: The function returns three value as below:
- Positive value: if the first differing character in lhs is greater than the corresponding character in rhs.
- Negative value: if the first differing character in lhs is less than the corresponding character in rhs.
- Zero: if the characters compared in both the strings form the same string.
Below programs illustrate the above function:
Program 1 :
// C++ program to illustrate the // wcsncmp() function #include <bits/stdc++.h> using namespace std; // function to compare two strings void check(wchar_t* lhs, wchar_t* rhs, int count) { int result; // compare lhs and rhs by wcsncmp result = wcsncmp(lhs, rhs, count); // print, as per result if (result < 0) wcout << lhs << " precedes " << rhs << "\n"; else if (result > 0) wcout << rhs << " precedes " << lhs << "\n"; else wcout << L"First " << count << L" characters of " << L" are same" << "\n"; } // Driver code int main() { // intialize two strings lhs and rhs to compare wchar_t lhs[] = L"geekforgeeks"; wchar_t rhs[] = L"geekGgeek"; // check till 4th characters and till 7th characters check(lhs, rhs, 4); check(lhs, rhs, 7); return 0; } |
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Output:
First 4 characters of are same geekGgeek precedes geekforgeeks
Program 2 :
// C++ program to illustrate the // wcsncmp() function #include <bits/stdc++.h> using namespace std; // function to compare two strings void check(wchar_t* lhs, wchar_t* rhs, int count) { int result; // compare lhs and rhs by wcsncmp result = wcsncmp(lhs, rhs, count); // print, as per result if (result < 0) wcout << lhs << " precedes " << rhs << "\n"; else if (result > 0) wcout << rhs << " precedes " << lhs << "\n"; else wcout << L"First " << count << L" characters of " << L" are same" << "\n"; } // Driver code int main() { // intialize two strings lhs and rhs to compare wchar_t lhs[] = L"01234GFG"; wchar_t rhs[] = L"01234GFG"; // check till 5th character // and again till 8th character check(lhs, rhs, 5); check(lhs, rhs, 8); return 0; } |
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Output:
First 5 characters of are same First 8 characters of are same
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