#include <iostream> #include <cmath> using namespace std; int main() { float a, b, c; float x1,x2; while (cin >> a >> b >> c) { // 注意 while 处理多个 case float deta = b *b -4*a*c; if(a == 0) cout << "Not quadratic equation" << endl; else if(deta == 0) ...
