Question

c++程序有错，哪位大侠能帮忙改一下啊？非常感谢！！！

#include <iostream>
using namespace std;
void main()
{
int i;
void sizeyunsuan();
void zhengshubei();
void sum();
void max();
void sushu();
cout<<" c++程序综合应用"<<endl;
cout<<" ==============================================="<<endl;
cout<<"(1):两整数的四则运算;"<<endl;
cout<<"(2):判断一整数是否既是5又是7的整数倍;"<<endl;
cout<<"(3):求分数序列1+1/3+1/5+1/7+……+1/n之和;"<<endl;
cout<<"(4):找出n个数中的最大数并输出;"<<endl;
cout<<"(5):输出100～200之间的素数;"<<endl;
cout<<"(6):退出程序。"<<endl;
cout<<"======================================"<<endl;
cout<<"请选择:"<<endl;
do
{
int flag=0;
cin>>i;
switch(i)
{
case 1 : sizeyunsuan(); break;
case 2 : zhengshubei(); break;
case 3 : sum(); break;
case 4 : max(); break;
case 5 : sushu(); break;
case 6 : flag=1; break;
default:cout<<"您的输入错误，请重新输入"<<endl;
}while(flag=0);
}
void sizeyunsuan();
{
float a,b;
cin>>a>>b;
cout<<"a+b="<<a+b<<endl;
cout<<"a-b="<<a-b<<endl;
cout<<"a*b="<<a*b<<endl;
cout<<"a/b="<<a/b<<endl;
}
void zhengshubei()
{
int a;
cin>>a;
if(a%5=0 && a%7=0)
cout<<"yes"<<endl;
else
cout<<"no"<<endl;
}
void sum()
{
int m,n;
int s=0;
cout<<"请输入最后一个分数的分母:"<<endl;
cin>>m;
for(n=1;n<=m;n+2)
{
s=s+1/n;
}
cout<<"分数序列1+1/3+1/5+1/7+……+1/n之和为"<<s<<endl;
}
void max()
{
float m;
float a[100];
int j,n;
cout<<"请问您要输入多少个数？"<<endl;
cin>>n;
cout<<"请输入这些数"<<endl;
for(j=0;j<n;j++)
{
cin>>a[j];
}
for(j=0;j<n;j++)
{
m=a[0];
if(m<a[j])
m=a[j];
}
cout<<"最大的数是:"<<m;
}
void sushu()
{
int num=100;
int i;
bool flag;
while( num<= 200 )
{
flag = true;
for( i = 2; i<num; i++)
{
if(num%i == 0)
{
flag = false;
break;
}
}
if(flag)
cout<<num<<"\t";
num ++;
}
}

Answer 1

改的地方加了注释
#include <iostream>
using namespace std;
int main()
{
int i;
int flag=0;
void sizeyunsuan();
void zhengshubei();
void sum();
void max();
void sushu();
cout<<" c++程序综合应用"<<endl;
cout<<" ==============================================="<<endl;
cout<<"(1):两整数的四则运算;"<<endl;
cout<<"(2):判断一整数是否既是5又是7的整数倍;"<<endl;
cout<<"(3):求分数序列1+1/3+1/5+1/7+……+1/n之和;"<<endl;
cout<<"(4):找出n个数中的最大数并输出;"<<endl;
cout<<"(5):输出100～200之间的素数;"<<endl;
cout<<"(6):退出程序。"<<endl;
cout<<"======================================"<<endl;
cout<<"请选择:"<<endl;
do
{

cin>>i;
switch(i)
{
case 1 : sizeyunsuan(); break;
case 2 : zhengshubei(); break;
case 3 : sum(); break;
case 4 : max(); break;
case 5 : sushu(); break;
case 6 : flag=1; break;
default:cout<<"您的输入错误，请重新输入"<<endl;
}//加个大括号和switch配对
}while(flag==0);//注意==和=的用法
system("pause");
}

void sizeyunsuan()//去掉分号
{
float a,b;
cin>>a>>b;
cout<<"a+b="<<a+b<<endl;
cout<<"a-b="<<a-b<<endl;
cout<<"a*b="<<a*b<<endl;
cout<<"a/b="<<a/b<<endl;
}
void zhengshubei()
{
int a;
cin>>a;
if(a%5==0 && a%7==0)//注意==和=的用法
cout<<"yes"<<endl;
else
cout<<"no"<<endl;
}
void sum()
{
int m,n;
int s=0;
cout<<"请输入最后一个分数的分母:"<<endl;
cin>>m;
for(n=1;n<=m;n+2)
{
s=s+1/n;
}
cout<<"分数序列1+1/3+1/5+1/7+……+1/n之和为"<<s<<endl;
}
void max()
{
float m;
float a[100];
int j,n;
cout<<"请问您要输入多少个数？"<<endl;
cin>>n;
cout<<"请输入这些数"<<endl;
for(j=0;j<n;j++)
{
cin>>a[j];
}
for(j=0;j<n;j++)
{
m=a[0];
if(m<a[j])
m=a[j];
}
cout<<"最大的数是:"<<m;
}
void sushu()
{
int num=100;
int i;
bool flag;
while( num<= 200 )
{
flag = true;
for( i = 2; i<num; i++)
{
if(num%i == 0)
{
flag = false;
break;
}
}
if(flag)
cout<<num<<"\t";
num ++;
}
}

追问

十分谢谢！！

Answer 2

#include <iostream>
using namespace std;
void main()
{
int flag;
int i;
void sizeyunsuan();
void zhengshubei();
void sum();
void max();
void sushu();
cout<<" c++程序综合应用"<<endl;
cout<<" ==============================================="<<endl;
cout<<"(1):两整数的四则运算;"<<endl;
cout<<"(2):判断一整数是否既是5又是7的整数倍;"<<endl;
cout<<"(3):求分数序列1+1/3+1/5+1/7+……+1/n之和;"<<endl;
cout<<"(4):找出n个数中的最大数并输出;"<<endl;
cout<<"(5):输出100～200之间的素数;"<<endl;
cout<<"(6):退出程序。"<<endl;
cout<<"======================================"<<endl;
cout<<"请选择:"<<endl;
do
{
int flag=0;
cin>>i;
switch(i)
{
case 1 : sizeyunsuan(); break;
case 2 : zhengshubei(); break;
case 3 : sum(); break;
case 4 : max(); break;
case 5 : sushu(); break;
case 6 : flag=1; break;
default:cout<<"您的输入错误，请重新输入"<<endl;
}

}while(flag==0);
}

void sizeyunsuan()
{
float a,b;
cin>>a>>b;
cout<<"a+b="<<a+b<<endl;
cout<<"a-b="<<a-b<<endl;
cout<<"a*b="<<a*b<<endl;
cout<<"a/b="<<a/b<<endl;
}
void zhengshubei()
{
int a;
cin>>a;
if(a%5==0 && a%7==0)
cout<<"yes"<<endl;
else
cout<<"no"<<endl;
}
void sum()
{
int m,n;
int s=0;
cout<<"请输入最后一个分数的分母:"<<endl;
cin>>m;
for(n=1;n<=m;n+2)
{
s=s+1/n;
}
cout<<"分数序列1+1/3+1/5+1/7+……+1/n之和为"<<s<<endl;
}
void max()
{
float m;
float a[100];
int j,n;
cout<<"请问您要输入多少个数？"<<endl;
cin>>n;
cout<<"请输入这些数"<<endl;
for(j=0;j<n;j++)
{
cin>>a[j];
}
for(j=0;j<n;j++)
{
m=a[0];
if(m<a[j])
m=a[j];
}
cout<<"最大的数是:"<<m;
}
void sushu()
{
int num=100;
int i;
bool flag;
while( num<= 200 )
{
flag = true;
for( i = 2; i<num; i++)
{
if(num%i == 0)
{
flag = false;
break;
}
}
if(flag)
cout<<num<<"\t";
num ++;
}
}