C++第二章作业
1.(1)if...else 用法
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
char X;
cout<<"Menu:A(dd) D(elete) S(ort) Q(uit),Select one:"<<endl;
while(cin>>X){
if(X=='A')
cout<<"Data has been added"<<endl;
else if(X=='D')
cout<<"Data has been deleted"<<endl;
else if(X=='S')
cout<<"Data has been sorted"<<endl;
else if(X=='Q')
break;
else
cout<<"Data does not exist"<<endl;
}
return 0;
}
(2)switch 用法
#include <iostream>
using namespace std;
int main()
{
char X;
cout<<"Menu:A(dd) D(elete) S(ort) Q(uit),Select one:"<<endl;
while(cin>>X){
if(X=='Q')
break;
switch(X){
case 'A': cout<<"Data has been added"<<endl;
break;
case 'D': cout<<"Data has been deleted"<<endl;
break;
case 'S': cout<<"Data has been sorted"<<endl;
break;
default: cout<<"Data does not exist"<<endl;
break;
}
}
return 0;
}
2.（1）for 用法
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
int i,j,k;
for(i=2;i<=100;i++)
{
k=sqrt((double)i);
for(j=2;j<=k;j++)
{
if(i%j==0)
break;
}
if(j>k)
cout<<i <<" ";
}
return 0;
}
（2）while 用法
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
int i=2,j,k;
while(i<=100)
{
k=sqrt((double)i);
for(j=2;j<=k;j++)
{
if(i%j==0)
break;
}
if(j>k)
cout<<i <<" ";
i++;
}
return 0;
}
（3）do...while 用法
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
int i=2,j,k;
do
{
k=sqrt((double)i);
for(j=2;j<=k;j++)
{
if(i%j==0)
break;
}
if(j>k)
cout<<i <<" ";
i++;
}while(i<=100);
return 0;
}
3.(1)while 用法
#include<iostream>
using namespace std;
int main()
{
int i=23,j;
cout<<"Guess the num between 1 and 100:"<<endl;
while(cin>>j)
{
if(j>i&&j<=100)
cout<<"bigger than the num"<<endl;
else if(j>=1&&j<i)
cout<<"lower than the num"<<endl;
else if(j==i)
cout<<"Congratulations! You're right."<<endl;
else
cout<<"Error"<<endl;
}
return 0;
}
（2）do...while 用法
#include<iostream>
using namespace std;
int main()
{
int i=23,j;
cout<<"Guess the num between 1 and 100:"<<endl;
do
{
if(j>i&&j<=100)
cout<<"bigger than the num"<<endl;
else if(j>=1&&j<i)
cout<<"lower than the num"<<endl;
else if(j==i)
cout<<"Congratulations! You're right."<<endl;
else
cout<<"Error"<<endl;
}while(cin>>j);
return 0;
}
4.
#include<iostream>
using namespace std;
int main()
{
cout<<"the ways to go together is ";
int i,sum=1;
for(i=5;i>=3;i--)
{
sum*=i;
}
for(i=3;i>=1;i--)
{
sum/=i;
}
cout <<sum;
return 0;
}
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