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freshman-training-task-code
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c task1-9.cpp

//任务1：输入3个数，求最大值
/*#include<iostream>
using namespace std;

int maxof3(int a,int b,int c)
{
	int result;

	if(a>b)
	{
		if(a>c)
		{
			result=a;
		}
		else
		{
			result=c;
		}
	}
	else if(b>c)
	{
		result=b;
	}
	else
	{
		result=c;
	}

	return result;
}

int main()
{
	int a,b,c;
	int result;
	cout<<"Input three numbers, and press Enter next time for each one:"<<endl;
	cin>>a>>b>>c;
	result=maxof3(a,b,c);
	cout<<"The max digigt is "<<result<<endl;

	return 0;
}*/

//任务2：编程序，求方程ax2+bx+c=0的根
/*#include<iostream>
#include<cmath>
using namespace std;

int main()
{

    float a, b, c, x1, x2, discriminant, realPart, imaginaryPart;
    cout << "Input a, b and c: (pressing Enter or Space after inputing a digit)"<<endl;
    cin >> a >> b >> c;
    discriminant = b*b - 4*a*c;

    if (discriminant > 0)
	{
        x1 = (-b + sqrt(discriminant)) / (2*a);
        x2 = (-b - sqrt(discriminant)) / (2*a);
        cout << "Roots are different:" << endl;
        cout << "x1 = " << x1 << endl;
        cout << "x2 = " << x2 << endl;
    }
    else if (discriminant == 0)
	{
        cout << "Roots are the same:" << endl;
        x1 = (-b + sqrt(discriminant)) / (2*a);
        cout << "x1 = x2 =" << x1 << endl;
    }
    else
	{
        realPart = -b/(2*a);
        imaginaryPart =sqrt(-discriminant)/(2*a);
        cout << "Includeing ImaginaryPart:"  << endl;
        cout << "x1 = " << realPart << "+" << "i" << imaginaryPart << endl;
        cout << "x2 = " << realPart << "-" << "i" << imaginaryPart << endl;
    }

    return 0;
}*/

//任务3：输入3个double类型的值，判断这3个值是否可以表示一个三角形的三条边
/*#include<iostream>
using namespace std;

int main()
{
	double a,b,c;
	cout<<"Input 3 digits for the 3 lines of a triangle:"<<endl;
	cin>>a>>b>>c;

	if(a+b>c && a+c>b && b+c>a)
	{
		cout<<"A triangle can be made up of these 3 lines"<<endl;
	}
	else
	{
		cout<<"A triangle can't be made up of these 3 lines"<<endl;
	}

	return 0;
}*/

//任务4：输入20个数，求其最大、最小和平均值
/*#include<iostream>
using namespace std;

int main()
{
	int Num[20];
	int i;
	float max,min,sum,average;
	cout<<"Please input 20 digites:(you'd better use the Enter instead of Space after inputing a digite in case of entering over 20 digites)"<<endl;
	for(i=0;i<20;i++)
	{
		cin>>Num[i];
	}

	max=min=Num[0];
	for(i=1;i<20;i++)
	{
		if(Num[i]>max)
		{
			max=Num[i];
		}
		else if(Num[i]<min)
		{
			min=Num[i];
		}
	}

	sum=Num[0];
	for(i=1;i<20;i++)
	{
		sum+=Num[i];
	}
	average = sum/20;

	cout<<"The max is:"<<max<<endl;
	cout<<"The min is:"<<min<<endl;
	cout<<"The average is:"<<average<<endl;
	return 0;
}*/

//任务5：输入若干个数，设输入的第一个数为后面要输入的数的个数，求平均值及最大值
/*#include<iostream>
using namespace std;

int main()
{
	int num[9999];
	int n;
	float max,sum,average;
	cout<<"Input some digites:(The first digite entered is the number of subsequent digites entered)"<<endl;
	cout<<"Notice:You'd better use the Enter instead of Space after inputing a digite in case of entering over n digites."<<endl;
	cin>>n;
	for(int i=0;i<n;i++)
	{
		cin>>num[i];
	}

	max=n;
	for(int i=0;i<n;i++)
	{
		if(num[i]>n)
		{
			max=num[i];
		}
	}

	sum=n;
	for(int i=0;i<n;i++)
	{
		sum+=num[i];
	}
	average=sum/(n+1);

	cout<<"The max is:"<<max<<endl;
	cout<<"The average is:"<<average<<endl;
	return 0;
}*/

//任务6：输入若干个数，输入字符s表示结束，求平均值及最大值
/*#include<iostream>
using namespace std;

int main()
{
	int i;
	float n,max=0,sum=0,average;
	cout<<"Enter some digites(Enter the character 's' to indicate the end):"<<endl;
	for(i=0;;i++)
	{
		cin>>n;
		sum+=n;
		if(n>max)
		{
			max=n;
		}
		char c = getchar();
		if(c == 's')
		{
			break;
		}
	}

	average=sum/i;
	cout<<"The max is:"<<max<<endl;
	cout<<"The average is:"<<average<<endl;

	return 0;
}*/

//任务7：求和 s=1X1 + 2X2 + 3X3 +…+ 100X100
/*#include<iostream>
using namespace std;

int main()
{
	int i,sum=0;

	for(i=1;i<=100;i++)
	{
		sum+=i*i;
	}

	cout<<"The sum of 1*1+2*2+...+100*100 is:"<<sum<<endl;

	return 0;
}*/

//任务8：印度国王的奖励，求2的0次方加到2的63次方之和
/*#include<iostream>
#include<cmath>
using namespace std;

int main()
{
	int i;
	double sum=0;
	for(i=0;i<64;i++)
	{
		sum+=pow(2,i);
	}
	cout<<"2^0+...+2^63 = "<<sum<<endl;

	return 0;

}*/

//任务9：求和 s=1! + 2! + 3! +…+ 10!
/*#include <iostream>
using namespace std;

int main()
{
    int i,n=1,sum=0;
    for(i=1;i<=10;i++)
    {
    	n*=i;
    	sum+=n;
	}
    cout<<"The sum is:"<<sum<<endl;

    return 0;
}*/

//Test 1
/*#include<iostream>
using namespace std;

//最小值函数
float min(float a1,float a2,float a3,float a4,float a5)
{
	float min;
	if(a1<a2 && a1<a3 && a1<a4 && a1<a5)
	{
		min = a1;
	}
	else if(a2<a1 && a2<a3 && a2<a4 && a2<a5)
	{
		min = a2;
	}
	else if(a3<a1 && a3<a2 && a3<a4 && a3<a5)
	{
		min = a3;
	}
	else if(a4<a1 && a4<a2 && a4<a3 && a4<a5)
	{
		min = a4;
	}
	else if(a5<a1 && a5<a2 && a5<a3 && a5<a4)
	{
		min = a5;
	}

	return min;
}
//求和函数
float sum(float a1,float a2,float a3,float a4,float a5)
{
	float sum=0;
	sum = a1+a2+a3+a4+a5;

	return sum;

}

//中位数函数
float middle(float a1,float a2,float a3,float a4,float a5)
{
	float middle;
	float n[5] = {a1,a2,a3,a4,a5};
	for(int i=0;i<4;i++)
	{
		if(n[i]>n[i+1])
		{
			middle=n[i];
			n[i]=n[i+1];
			n[i+1]=middle;
		}
	}

	middle = n[2];

	return middle;
}

int main()
{
	float a1,a2,a3,a4,a5,mins,middles,sums;
	cout<<"Please input 5 float digits:"<<endl;
	cin>>a1>>a2>>a3>>a4>>a5;

	mins = min(a1,a2,a3,a4,a5);
	middles = middle(a1,a2,a3,a4,a5);
	sums = sum(a1,a2,a3,a4,a5);

	cout<<"The min = "<<mins<<endl;
	cout<<"The middle = "<<middles<<endl;
	cout<<"The sum = "<<sums<<endl;
	return 0;
}*/

//Test 2
/*#include<iostream>
#include<ctime>
using namespace std;

int main()
{
	// 基于当前系统的当前日期/时间
   time_t now = time(0);

   // 把 now 转换为字符串形式
   tm *dt = localtime(&now);

   cout << "Now is \n" <<1900+ dt->tm_year<<"-"<<1+dt->tm_mon <<"-"<<dt->tm_mday<<endl;
   cout <<"It is the "<<dt->tm_wday <<" st/nd/th of a week."<<endl;

	return 0;
}*/

//Test 3没时间做