URAL - 1823 Ideal Gas(审题)

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p = 1
n = 1
V = 1

T = 0.120279

比赛时没做出来，注意审题，难点在什么时候输出error，undefined，p=0且n=0时要输出undefined，p=0求n或n=0求p时，因为T和V为正，输入错误，要输出error。

#include<iostream>
#include<iomanip>
using namespace std;
const double r = 8.314;
int main()
{
	double p, v, n, t;
	char type, op;
	double num;
	while (cin >> type)
	{
		p = v = n = t = -1;
		cin >> op;
		cin >> num;
		switch (type)
		{
		case 'p': p = num; break;
		case 'n': n = num; break;
		case 'V': v = num; break;
		case 'T': t = num; break;
		}
		cin >> type >> op >> num;
		switch (type)
		{
		case 'p': p = num; break;
		case 'n': n = num; break;
		case 'V': v = num; break;
		case 'T': t = num; break;
		}
		cin >> type >> op >> num;
		switch (type)
		{
		case 'p': p = num; break;
		case 'n': n = num; break;
		case 'V': v = num; break;
		case 'T': t = num; break;
		}
		if (p == 0 && n == 0) { cout << "undefined" << endl; continue; }
		if (p == 0 && n != -1 || n == 0 && p != -1){ cout << "error" << endl; continue; }
		if (p == -1) { p = (n*r*t) / v; cout << 'p' << ' ' << '=' << ' ' << fixed << setprecision(6) << p << endl; continue; }
		if (n == -1) { n = (p*v) / (r*t); cout << 'n' << ' ' << '=' << ' ' << fixed << setprecision(6) << n << endl; continue; }
		if (v == -1) { v = (n*r*t) / p; cout << 'V' << ' ' << '=' << ' ' << fixed << setprecision(6) << v << endl; continue; }
		if (t == -1) { t = (p*v) / (n*r); cout << 'T' << ' ' << '=' << ' ' << fixed << setprecision(6) << t << endl; continue; }
	}
}

URAL - 1823 Ideal Gas(审题)

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原文地址：http://blog.csdn.net/qq_18738333/article/details/45183889