c语言 quant函数
    English Answer:
    The `quant` function in C is used to convert a double-precision floating-point number to a __int64 integer. It is defined in the `<math.h>` header file. The syntax of the `quant` function is as follows:
    c.
    __int64 quant(double x);
    The `quant` function takes a single argument, which is a double-precision floating-point number. It returns the __int64 integer that is closest to the argument. If the argument is exactly halfway between two integers, the function returns the even integer.
    The `quant` function can be used to convert floating-point numbers to integers for a variety of purposes. For example, it can be used to convert the result of a calculation to an integer, or to convert the value of a user input to an integer.
    Here is an example of how to use the `quant` function:
    c.
    #include <math.h>。
    int main() {。
      double x = 3.14;
      __int64 y = quant(x);
      printf("The __int64 integer closest to %f is %lld.\n", x, y);
      return 0;
    }。
    This program will print the following output:
    The __int64 integer closest to 3.140000 is 3.
    Chinese Answer:
    C语言中的`quant`函数用于将双精度浮点数转换为`__int64`整数。它在`<math.h>`头文件中定义。`quant`函数的语法如下：printf函数的用法python
    c.
    __int64 quant(double x);
    `quant`函数接收一个参数，即双精度浮点数。它返回最接近该参数的`__int64`整数。如果参数恰好在两个整数之间，则该函数返回偶数整数。
    `quant`函数可以用于将浮点数转换为整数，用于各种目的。例如，它可以用于将计算结果转换为整数，或将用户输入的值转换为整数。
    以下是`quant`函数用法示例：
    c.
    #include <math.h>。
    int main() {。
      double x = 3.14;
      __int64 y = quant(x);
      printf("最接近%f的__int64整数是%lld。\n", x, y);
      return 0;
    }。
    此程序将打印以下输出：
    最接近3.140000的__int64整数是3。