第四章作业

#include <iostream>
using namespace std;
int main()
{
int a[10],i;
for(i=0;i<10;i++)
a[i]=i*2+2;
for(i=0;i<10;i++)
{
cout<<a[i]<<'\t';
if((i+1)%5==0)
cout<<endl;
}
return 0;
}

#include<iostream>
using namespace std;
int main()
{
int i,math[40],n;
float aver = 0.0;
int unpassedcount=0;
int highscorecount=0;
cout<<"请输入人数:";
cin>>n;
cout<<"请输入成绩:";
for(i=0;i<n;i++)
{
cin>>math[i];
aver+=math[i];
}
aver/=n;
for(i=0;i<n;i++)
{
if(math[i]<60)unpassedcount++;
if(math[i]>=90)highscorecount++;
}
cout<<"平均分:"<<aver<<endl;
cout<<"不及格人数为:"<<unpassedcount<<endl;
cout<<"高分层人数为:"<<highscorecount<<endl;
return 0;
}

#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
int a[10],i,big;
cout<<"please input 10 numbers:\n";
for(i=0;i<10;i++)
cin>>a[i];
cout<<"the number are:";
for(i=0;i<10;i++)
cout<<setw(4)<<a[i];
cout<<endl;
big=a[0];
for(i=1;i<10;i++)
if(a[i]>big)
big=a[i];
cout<<"the big number is:"<<big<<endl;
return 0;

}

#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
int a[10];
int i,j,t;
cout<<"please input 10 number:";
for(i=0;i<10;i++)
cin>>a[i];
cout<<"the number are:";
for(i=0;i<10;i++)
cout<<setw(4)<<a[i];
cout<<endl;
for(i=0;i<9;i++)
for(j=0;j<9-i;j++)
if(a[j]>a[j+1])
{t = a[j];a[j] = a[j+1];a[j+1] = t;}
cout<<"the sorted number are:";
for(i=0;i<10;i++)
cout<<setw(4)<<a[i];
cout<<endl;
return 0;
}

#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
int a[5],i,j,t;
cout<<"please input 5 numbers:";
for (i=0;i<5;i++)
cin>>a[i];
for(i=0;i<4;i++)
for(j=0;j<4-i;j++)
if(a[j]<a[j+1])
{t=a[j];a[j]=a[j+1];a[j+1]=t;}
cout<<"从大到小的顺序为：";
for(i=0;i<5;i++)
cout<<setw(4)<<a[i];
cout<<endl;
return 0;
}