第四周作业

5

#include <iostream>

using namespace std;

int main()
{
int i=0;
double value=1,fact=1;
while (fact>=10e-6)
{
i++;
fact=fact/i;
value+=fact;
}
cout << "e = "<<value<<endl;
return 0;
}



6

#include <iostream>
using namespace std;

int main()
{
double pi, i, k, t;
pi = 0,k = i = t = 1;
while(t>10e-6)
{
pi += 4*1.0/i*k;
t = 1.0/i;
k *= -1;
i = i+2;

}
cout<<"pi = "<<pi<<endl;

return 0;
}



7

#include<iostream>
using namespace std;
int main()
{
int a;
cout<<"请输入一数值：";
cin>>a;
if(a<10) cout<<a<<"is-∞to10";
else if(a>=10&&a<=100) cout<<a<<"is10to100";
else if(a>100&&a<=1000) cout<<a<<"is100to1000";
else cout<<a<<"is1000to+∞";
return 0;
}

8
#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
cout<<setw(7)<<"*"<<endl;
cout<<setw(9)<<"* * *"<<endl;
cout<<setw(11)<<"* * * * *"<<endl;
cout<<setw(13)<<"* * * * * * *"<<endl;
cout<<setw(11)<<"* * * * *"<<endl;
cout<<setw(9)<<"* * *"<<endl;
cout<<setw(7)<<"*"<<endl;
return 0;
}



9

#include <iostream>

using namespace std;

int main()
{
int sum=0,n;
for(n=1; ;n++)
{
sum+=n*n;
if(sum>=1000)
break;
}
sum-=n*n;
cout<<"满足“1^2+2^2+3^2+…+n^2<=1000”的最大n值为"<<n-1<<endl;
return 0;
}



10

#include<iostream>
using namespace std;

int main()
{
long unsigned int a=0,sum1=0,sum2=0;
double b=0.01;
while(a<30)
{
sum1 +=100000;
b=b*2;
sum2 +=b;
a++;
}
cout<<"陌生人一共给了百万富翁"<<sum1<<"元"<<endl;
cout<<"百万富翁一共给了陌生人"<<sum2<<"元"<<endl;

return 0;
}



作业2

#include<iostream>
using namespace std;

int main()
{
int x,y,z,sum,num;
for(x=0;x<=20;x++)
for(y=0;y<34;y++)
for(z=0;z<=99;z+=3)
{
sum =x+y+z;
num =5*x+3*y+z/3;
if(sum==100&&num==100)
{
cout<<"公鸡数为:"<<x<<endl;
cout<<"母鸡数为:"<<y<<endl;
cout<<"小鸡数为:"<<z<<endl;
cout<<"另一种情况如下:"<<endl;
}
}

return 0;
}



作业3

#include<iostream>
using namespace std;

int main()
{
long int n,i=0,sum=0;
cout<<"请输入一个数:"<<endl;
cin>>n;
while(n!=0)
{
sum +=n%10;
n=n/10;
i++;
}
cout<<"所输入的数是一个"<<i<<"位数"<<endl;
cout<<"各位数之和是:"<<sum<<endl;

return 0;
}



作业4

#include <iostream>
using namespace std;

int main()
{
int x, y;
cout<<"请输入该点的横坐标：";
cin>>x;
cout<<"请输入该点的纵坐标：";
cin>>y;
cout<<"该点的坐标为："<<"("<<x<<","<<y<<")"<<endl;
if(((x+2)*(x+2)+(y+2)*(y+2)<=1)
||((x-2)*(x-2)+(y+2)*(y+2)<=1)
||((x+2)*(x+2)+(y-2)*(y-2)<=1)
||((x-2)*(x-2)+(y-2)*(y-2)<=1))
cout<<"该点建筑物的高度为10m。"<<endl;
else
cout<<"该点建筑物的高度为0m。"<<endl;
return 0;
}



作业5

#include<iostream>
using namespace std;
int main()
{
int n,x,a=1,sum=0,s;
cout<<"请输入一个数:"<<endl;
cin>>x;
n=1;
s=1;
while(n<=x)
{
s*=n;
sum+=s;
n++;
}
cout<<x<<"的各阶乘的和sum="<<sum<<endl;

return 0;
}



作业6

#include <iostream>
using namespace std;

int main()
{
int x1,x2,day;
day=1;
x2=1;
do
{
x1=(x2+1)*2;
x2=x1;
day++;
}while(day<=9);
cout<<"苹果的总数是"<<x1<<endl;
return 0;
}



作业7

#include<iostream>
using namespace std;

int main()
{
int a,b=0,n,s=0,i=1;
cout<<"s
=a+aa+aaa+aa...a(n个）的值。"<<endl;
cout<<"请输入一个小于10的正整数a"<<endl;
cin>>a;
cout<<"请输入一个正整数n"<<endl;
cin>>n;
while(i<=n)
{
b=b*10+a;
s +=b;
i++;

}
cout<<"s
="<<s<<endl;

return 0;
}



作业8

#include <iostream>
using namespace std;

int main()
{
int i,j;
for(i=1;i<=9;i++)
{

for(j=1;j<=9;j++)
cout<<left<<"\t"<<i<<"×"<<j<<"="<<i*j;
cout<<endl;
}
return 0;
}



作业9

#include<iostream>
using namespace std;

int main()
{
int m=0;
char x,y,z;
cout<<"将张三，李四，王五分别记为a,b,c"<<endl;
cout<<"将陈六，赵七，宋八分别记为A,B,C"<<endl;
for(x='A';x<='C';x++)
for(y='A';y<='C';y++)
for(z='A';z<='C';z++)
{
if(x!=y&&x!=z&&y!=z)
{
if(x!='A'&&z!='A'&&z!='C')
{
cout<<"比赛名单如下："<<endl;
cout<<"a--"<<x<<" "<<"b--"<<y<<" "<<"c--"<<z<<" ";

}
}
}
return 0;
}