C++中的remquo()

此函数用于返回其参数中提到的2个浮点数的余数(模数)，并且还存储商与传递给它的指针的商。计算出的商会四舍五入。

余数=数字– rquot *十进制
其中，rquot是以下各项的结果：分子/分母，四舍五入到最接近的整数值(中途情况四舍五入到偶数)。

句法：

long double remquo(long double a, long double b, int* q);
double remquo(double a, double b, int* q);
float remquo(float a, float b, int* q);

Parameter:

a and b are the values of numerator and denominator. q is the pointer in which quotient will be stored.

Return:

It returns the floating point remainder of numerator/denominator rounded to nearest and stores quotient in q.

错误：

1. 必须提供所有三个参数，否则将给出错误的不匹配函数来调用’remquo’ 。
2. 必须将第三个参数传递给指针，因为它存储商的地址，否则将给出错误“ remquo(double＆，double＆，int＆)”

   。

例子：

Input : remquo(12.5, 2.2, &q)
Output : -0.7 and q=6

解释：

Input : remquo(-12.5, 2.2, &q)
Output : 0.7 and q=-6

＃代码1

// CPP implementation of the above 
// function
#include 
#include 
  
using namespace std;
  
int main()
{
    int q;
    double a = 12.5, b = 2.2;
  
    // it will return remainder 
    // and stores quotient in q
    double answer = remquo(a, b, &q);
      
    cout << "Remainder of " << a << "/" 
         << b << " is " << answer << endl;
      
    cout << "Quotient of " << a << "/" 
         << b << " is " << q << endl
         << endl;
  
    a = -12.5;
      
    // it will return remainder 
    // and stores quotient in q
    answer = remquo(a, b, &q);
      
    cout << "Remainder of " << a << "/" << b 
         << " is " << answer << endl;
      
    cout << "Quotient of " << a << "/" << b 
         << " is " << q << endl
         << endl;
  
    b = 0;
      
    // it will return remainder
    // and stores quotient in q
    answer = remquo(a, b, &q);
      
    cout << "Remainder of " << a << "/" << b 
         << " is " << answer << endl;
      
    cout << "Quotient of " << a << "/" << b 
         << " is " << q << endl
         << endl;
  
    return 0;
}

输出 ：

Remainder of 12.5/2.2 is -0.7
Quotient of 12.5/2.2 is 6

Remainder of -12.5/2.2 is 0.7
Quotient of -12.5/2.2 is -6

Remainder of -12.5/0 is -nan
Quotient of -12.5/0 is -6

＃代码2

// CPP implementation of the
// above function
#include 
#include 
  
using namespace std;
  
int main()
{
    int q;
    double a = 12.5;
    int b = 2;
  
    // it will return remainder
    // and stores quotient in q
    double answer = remquo(a, b, &q);
      
    cout << "Remainder of " << a << "/" << b 
         << " is " << answer << endl;
      
    cout << "Quotient of " << a << "/" << b 
         << " is " << q << endl
         << endl;
  
    return 0;
}

输出 ：

Remainder of 12.5/2 is 0.5
Quotient of 12.5/2 is 6

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