What is the translation of wcstoll() function in C/C++?

The wcstoll() function is used to convert a wide string into a long integer. It sets the pointer to point to the first character after the last character. The syntax is as follows.

long long wcstoll(const wchar_t* str, wchar_t** str_end, int base)

This function requires three parameters. The parameters are as follows -

• #str: This is the beginning of a wide string.
• str_end: The function sets str_end to the next character after the last valid character (if there is any character), otherwise to null.
• base: This specifies the base. The base value can be (0, 2, 3, …, 35, 36)

This function returns the converted long long integer. When the character points to NULL, 0 is returned.

Example

#include <iostream>
using namespace std;
main() {
   //Define two wide character string
   wchar_t string1[] = L"777HelloWorld";
   wchar_t string2[] = L"565Hello";
   wchar_t* End; //The end pointer
   int base = 10;
   int value;
   value = wcstoll(string1, &End, base);
   wcout << "The string Value = " << string1 << "\n";
   wcout << "Long Long Int value = " << value << "\n";
   wcout << "End String = " << End << "\n"; //remaining string after long long integer
   value = wcstoll(string2, &End, base);
   wcout << "\nThe string Value = " << string2 << "\n";
   wcout << "Long Long Int value = " << value << "\n";
   wcout << "End String = " << End; //remaining string after long long integer
}

Output

The string Value = 777HelloWorld
Long Long Int value = 777
End String = HelloWorld
The string Value = 565Hello
Long Long Int value = 565
End String = Hello

Now let’s look at an example with different base values. The base here is 16. By getting a string in a given base, it will be printed in decimal format.

Example

#include <iostream>
using namespace std;
main() {
   //Define two wide character string
   wchar_t string1[] = L"5EHelloWorld";
   wchar_t string2[] = L"125Hello";
   wchar_t* End; //The end pointer
   int base = 16;
   int value;
   value = wcstoll(string1, &End, base);
   wcout << "The string Value = " << string1 << "\n";
   wcout << "Long Long Int value = " << value << "\n";
   wcout << "End String = " << End << "\n"; //remaining string after long long integer
   value = wcstoll(string2, &End, base);
   wcout << "\nThe string Value = " << string2 << "\n";
   wcout << "Long Long Int value = " << value << "\n";
   wcout << "End String = " << End; //remaining string after long long integer
}

Output

The string Value = 5EHelloWorld
Long Long Int value = 94
End String = HelloWorld
The string Value = 125Hello
Long Long Int value = 293
End String = Hello

Here the string contains 5E so its value is decimal 94 and the second string contains 125. This is 293 in decimal.

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