第四周作业

#include<iostream>
using namespace std;

int main()
{
int i,j;
for (i=0;i<5;i++)
{
for (j=i;j<5;j++)
cout<<"*";
cout<<endl;
}

return 0;
}

#include<iostream>
using namespace std;

int main()
{
double b=1,c=1,g=1;
int a,d=1;
while(!(b<1e-6))
{
for(a=1;a<=d;a++)
c*=a;

b=1/c;
g+=b;
c=1;
d++;
}
cout<<"e="<<g<<endl;

return 0;
}

#include<iostream>
using namespace std;

int main()
{
double a=1,b=1,c,d,f=1,pai;
do
{
a+=2;
b*=-1;
c=1.0/a;
d=b*c;
f+=d;
}while(c>1e-6);
pai=4*f;
cout<<pai<<endl;

return 0;
}

#include<iostream>
using namespace std;

int main()
{
int z;
cout<<"请输入一数值:";
cin>>z;
if (z<=10) cout<<z<<"is-∞to10";
else if (z>10&&z<=100) cout<<z<<"is10to100";
else if (z>100&&z<=1000) cout<<z<<"is100to1000";
else cout<<z<<"is1000to+∞";
cout<<z<<endl;

return 0;
}

#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;
}

#include<iostream>
using namespace std;

int main()
{
int sum=0,n;
for(n=1;;n++)
{
sum=sum+n*n;
if (sum>=1000)
break;
}
cout<<"满足\"1*1+2*2+3*3+...+n*n<=1000\"d最大n值为"<<n-1<<endl;

return 0;
}

#include<iostream>
using namespace std;

int main()
{
double sum1=0,sum2,n,m=1;
for(n=0.01;m<=30;)
{
sum1+=n;
n=n*2;
m++;

}
sum2=100000*30;
cout<<"百万富翁给穷人的钱为:"<<sum1<<endl
<<"穷人给百万富翁的钱为:"<<sum2<<endl;

return 0;
}

#include<iostream>
using namespace std;

int main()
{
int i,j,sum;
for (i=1;i<=9;i++)
{
for (j=1;j<=i;j++)
{
sum=i*j;
cout<<j<<"*"<<i<<"="<<sum<<"\t";
}
cout<<endl;
}

return 0;
}