【C++】考研复习

1二进制转十进制输出

#include<iostream>
using namespace std;
double Power(double x, int n);//计算x的n次方

int main()
{
	double result=0.0;
	cout << "请输入八位二进制";
	for (int i = 7; i >=0; i--)
	{
		char ch8;
		cin >> ch8;
		if (ch8=='1')
		{
			result+=static_cast<int>(Power(2, i));
		}
	}
	cout << "十进制结果：" << result;
	system("pause");
	return 0;
}

double Power(double x, int n)
{
	double val = 1.0;
	while (n--)
	{
		val *= x;
	}
	return val;
}

2判断回文数

#include<iostream>
using namespace std;
bool Symm(unsigned n);
int main()
{
	for (int m = 11; m < 1000; m++)
	{
		if (Symm(m)&&Symm(m*m)&&Symm(m*m*m))
		{
			cout << "m：" << m << endl;
			cout << "m平方：" << m * m << endl;
			cout << "m立方：" << m * m*m << endl;
		}
	}
	return 0;
}
bool Symm(unsigned n)
{
	unsigned i = n;
	unsigned m = 0;
	while (i>0)
	{
		m = m * 10 + i % 10;
		i /= 10;
	}
	return m==n;//相等则为回文数则返回true 否则返回false
}

3泰勒展开式e^x,sinx

2020东软cpp第一题

#include<iostream>
#include<cmath>
using namespace std;
const double Tiny_value = 1e-9;
double Ex(double x);
double Sinx(double x);
int main()
{
	//输入1.2，输出3.32012
	//输入1，  输出2.71828
	cout << Ex(1) << endl;
	double r, s,k;
	cin >> r >> s;
	//r=5,s=8,k=1.37781
	if (r*r<=s*s)
	{
		k = sqrt(Sinx(r)*Sinx(r) + Sinx(s)*Sinx(s));
	}
	if (r*r>s*s)
	{
		k = Sinx(r*s) / 2;
	}
	cout << "结果" << k;
	return 0;
}
double Ex(double x)
{
	double g = 1;
	int n = 1;
	double t = x;
	do
	{
		g += t;
		n++;
		t = t * x / n;
	} while (fabs(t)>=1e-10);
	return g;
}
double Sinx(double x)
{
	double g = 0;
	int n = 1;
	double t = x;
	do
	{
		g += t;
		n++;
		t = -t *x*x / (2 * n - 1) / (2 * n - 2);
	} while (fabs(t)>=Tiny_value);
	return g;
}

4利用arctanx展开求pai

5掷色子

#include<iostream>
//#include<ctime>
#include<cstdlib>
using namespace std;
int main()
{
	//srand((unsigned int)time(NULL));
	unsigned int t;
	cout << "请输入作为随机种子:";
	cin >> t;
	srand((unsigned int)t);
	int p,sum=0;
	int c=1;//表示游戏轮次
	int flag = 1;
	int res = 0;//每一次摇色子的结果
	while (flag)
	{
		for (int i = 0; i < 2; i++)
		{
			p = 1 + rand() % 6;//产生1-6的随机数
			cout << "产生了:" << p<<" ";
			res += p;//每轮的点数
		}
		cout <<"点数和为"<<res<< endl;
		if (c == 1)
		{
			if (res == 7 || res == 11)
			{
				cout << "点数为" << res << endl;
				cout << "第" << "1" << "轮" << "you win";
				flag = 0;
			}
			if (res == 2 || res == 3 || res == 12)
			{
				cout << "点数为" << res << endl;
				cout << "第1" << "轮" << "you lose";
				flag = 0;
			}
		}
		if (c > 1 )
		{
			if (res == 7)
			{
				cout << "第" << c << "轮出现7 you lose";
				flag = 0;
			}
			if (res == sum)
			{
				cout << "此轮点数等于上一轮和数为" << sum << endl;
				cout << "第" << c << "轮" << "you win";
				flag = 0;
			}
		}
		sum += res;
		res = 0;
		c++;//累计轮次
	}
	return 0;
}

答案写法如下

本文地址：https://blog.csdn.net/qq_42837890/article/details/107342725