[問題] C++ 一元二次方程式的解...
#include <cstdlib>
#include <iostream>
#include <cmath>
using namespace std;
int main(int argc, char *argv[])
{
double a,b,c,d,x,y,x1,x2;
y=a*x*x+b*x+c;
cout << "The program will caculate the equation./n";
cout << "Please enter a:";
cin >> a;
cout << "Please enter b:";
cin >> b;
cout << "Please enter c:";
cin >> c;
d=b*b-4*a*c;
if (d>=0)
x1=(-b+sqrt(b*b-4*a*c))/(2*a);
cout << " The answer x1 is " ;
x2=(-b-sqrt(b*b-4*a*c))/(2*a);
cout << " The answer x2 is " ;
else
cout << "There is no answer. ";
system("PAUSE");
return EXIT_SUCCESS;
}
我用Dev-C++ Complier之後他會跑出錯誤
expected primary-expression before "else"
可是我怎麼看都沒有錯...登登XD
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