#include <iostream>;
using namespace std;
/* this one works out when the float of the pi & area are in the end, but when it's in the top it does not work? */
int main()
{
float a, b;
/* float pi = 3.14 ;
float area = (pi*b*b/4) * ((2*a-b) / (2*a b)); if it's in here it doesn't work */
cout << "please inter number \n";
cin >> a ;
cout << "please inter number \n";
cin >> b ;
cout << "****\n" ;
float pi = 3.14 ;
float area = (pi*b*b/4) * ((2*a-b) / (2*a b));
cout << area << endl;
return 0;
}
uj5u.com熱心網友回復：
該區域的設定取決于運算式中使用的變數中當前的值。
使用頂部的運算式，既a沒有也b沒有設定為您的輸入值。相反，它們將具有一些任意值，這意味著您的區域也將具有一些任意值。使用and輸入后的運算式，這些值將是您輸入的實際值。ab
如果在計算之后立即放置以下代碼（在兩種情況下），您可以更清楚地看到這一點：
std::cout << "DEBUG: a = " << a << ", b = " << b
<< ", pi = " << pi << ", area = " << area << '\n';
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標籤：C 数学