c语言atoll函数怎么用

C ++ Atoll()函数 (C++ atoll() function)

atoll() function is a library function of cstdlib header. It is used to convert the given string value to the integer value. It accepts a string containing an integer (integral) number and returns its long long long integer value.

atoll()函数是cstdlib标头的库函数。 它用于将给定的字符串值转换为整数值。 它接受包含整数(整数)的字符串，并返回其long long long整数值。

Syntax of atoll() function:

atoll()函数的语法：

C++11:

C ++ 11：

long long int atoll (const char * str);

Parameter(s):

参数：

• str – represents a string containing an integer (integral) number.

  str –表示包含整数(整数)的字符串。

Return value:

返回值：

The return type of this function is long long int, it returns the long long long integer converted value.

此函数的返回类型为long long int ，它返回long long long long整数转换后的值。

Example:

例：

Input:    str = "123456789012345";    Function call:    atoll(str);    Output:    123456789012345

C ++代码演示atoll()函数示例 (C++ code to demonstrate the example of atoll() function)

// C++ code to demonstrate the example of// atoll() function#include 
    
     #include 
     
      #include 
      
       using namespace std;// main() sectionint main(){    char str[50];    strcpy(str, "123456789");    cout << "atoll(\"" << str << "\"): " << atoll(str) << endl;    strcpy(str, "-123456789");    cout << "atoll(\"" << str << "\"): " << atoll(str) << endl;    strcpy(str, "0");    cout << "atoll(\"" << str << "\"): " << atoll(str) << endl;    strcpy(str, "9876543120");    cout << "atoll(\"" << str << "\"): " << atoll(str) << endl;    strcpy(str, "-9876543120");    cout << "atoll(\"" << str << "\"): " << atoll(str) << endl;    strcpy(str, "123456789012345");    cout << "atoll(\"" << str << "\"): " << atoll(str) << endl;    return 0;}
      
     
    

Output

输出量

atoll("123456789"): 123456789atoll("-123456789"): -123456789atoll("0"): 0atoll("9876543120"): 9876543120atoll("-9876543120"): -9876543120atoll("123456789012345"): 123456789012345

Reference:

参考：

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c语言atoll函数怎么用