C++ 中的 ratio_greater_equal()函数

ratio_greater_equal()是 C++ 中的一个内置函数，用于检查比率 R1 是否大于或等于比率 R2。如果比率大于或等于比率 2，则返回 True，否则返回 false。

句法：

template < class ratio1_name, class ratio2_name > ratio_greater_equal

模板参数的函数接受两个模板参数比1和比*这些都是进行比较。

返回值：该函数返回一个布尔值，如果 ratio1 大于或等于 ratio2，则该值为真，否则返回假。

下面的程序说明了上述函数：

方案一：

// C++ program to illustrate the
// ratio_greater_equal function
// when both the ratios are equal
#include 
#include 
using namespace std;
int main()
{
    typedef ratio<3, 9> ratio1;
    typedef ratio<1, 3> ratio2;
  
    // check if R1>=R2
    if (ratio_greater_equal::value)
        cout << "3/9 is greater than or equal to 1/3";
    else
        cout << "3/9 is less than 1/3";
  
    return 0;
}

输出：

3/9 is greater than or equal to 1/3

方案二：

// C++ program to illustrate the
// ratio_greater_equal function
// to show greater than
#include 
#include 
using namespace std;
int main()
{
    typedef ratio<1, 2> ratio1;
    typedef ratio<1, 3> ratio2;
  
    // check if R1>=R2
    if (ratio_greater_equal::value)
        cout << "1/2 is greater than or equal to 1/3";
    else
        cout << "1/2 is less than 1/3";
  
    return 0;
}

输出：

1/2 is greater than or equal to 1/3

方案三：

// C++ program to illustrate the
// ratio_greater_equal function
// to show when less than
#include 
#include 
using namespace std;
int main()
{
    typedef ratio<1, 10> ratio1;
    typedef ratio<1, 8> ratio2;
  
    // check if R1>=R2
    if (ratio_greater_equal::value)
        cout << "1/10 is greater than or equal to 1/8";
    else
        cout << "1/10 is less than 1/8";
  
    return 0;
}

输出：

1/10 is less than 1/8