C /C++中的wcstoll()函数将wide-character字符串转换为长整数。它设置指针指向最后一个字符之后的第一个字符。
用法:
long long wcstoll( const wchar_t* str, wchar_t** str_end, int base )
参数:该函数接受三个强制性参数,如下所述:
- str: 它指定一个以整数开头的宽字符串。
- str_end:该函数将str_end值设置为下一个字符(在最后一个有效字符之后,如果有的话),否则它将指向NULL。
- base: 指定底数,底数的值可以为{0,2,3,…,35,36}。
返回值:该函数返回转换后的long long整数。它返回0,字符指向NULL。
以下示例程序旨在说明上述函数:
示例1:
// C++ program to illustrate
// the function wcstoll()
#include <bits/stdc++.h>
using namespace std;
int main()
{
// wide-character type array string starting
// with integral 'L'
wchar_t string1[] = L"888geekforgeeks";
wchar_t string2[] = L"999gfg";
// End pointer will point to the characters
// after integer, according to the base
wchar_t* End;
// Initializing base
int b = 10;
int value;
value = wcstoll(string1, &End, b);
value = wcstoll(string2, &End, b);
// prints the whole input string
wcout << "String Value = " << string1 << "\n";
wcout << "Long Long Int value = " << value << "\n";
// prints the end string after the integer
wcout << "End String = " << End << "\n";
wcout << "String Value = " << string2 << "\n";
wcout << "Long Long Int Value = " << value << "\n";
wcout << "End String = " << End << "\n";
return 0;
}
输出:
String Value = 888geekforgeeks Long Long Int value = 999 End String = gfg String Value = 999gfg Long Long Int Value = 999 End String = gfg
注意:底数的值可以是{0,2,3,…,35,36}。以2为底的一组有效数字是{0,1},以3为底的一组有效数字是{0,1,2},依此类推。对于从11到36的基数,有效数字包括字母。底数11的有效数字集为{0,1,…,9,A,a},底数12的有效数字为{0,1,…,9,A,a,B,b},依此类推。
示例2:具有不同基础的函数
// C++ program to illustrate the function wcstoll()
#include <bits/stdc++.h>
using namespace std;
int main()
{
// End pointer, will point to the characters
// after integer, according to the base
wchar_t* End;
// wide-character type array string
wchar_t string[] = L"1356geekforgeeks";
// Prints the long long integer provided with base 5
wcout << "Long Long Int with base5 = "
<< wcstoll(string, &End, 5) << "\n";
wcout << "End String = " << End << "\n";
// Prints the long long integer provided with base 12
wcout << "Long Long Int with base12 = "
<< wcstoll(string, &End, 12) << "\n";
wcout << "End String = " << End << "\n";
// Prints the long long integer provided with base 36
wcout << "Long Long Int with base36 = "
<< wcstoll(string, &End, 36) << "\n";
wcout << "End String = " << End << "\n";
return 0;
}
输出:
Long Long Int with base5 = 8 End String = 56geekforgeeks Long Long Int with base12 = 2226 End String = geekforgeeks Long Long Int with base36 = 9223372036854775807 End String =
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注:本文由纯净天空筛选整理自AmanSrivastava1大神的英文原创作品 wcstoll() function in C/C++。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。