void型態(tài)沒有回傳值
#include <iostream>
using namespace std;
int main()
{
void print(int);
print(25);
system("pause");
return 0;
}
void print(int age)
{
cout<<"我今年"<<age<<"歲"<<endl;
}
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印星星
#include <iostream>
using namespace std;
int main()
{
void square(int,int);
square(5,6);
system("pause");
return 0;
}
void square(int a,int b)
{
int i,j;
for(i=1;i<=a;i++)
{
for(j=1;j<=b;j++)
cout<<"*";
cout<<endl;
}
}
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印框的星星
#include <iostream>
using namespace std;
int main()
{
void printstar(int,int);
printstar(5,6);
system("pause");
return 0;
}
void printstar(int a,int b)
{
int i,j,k;
for(i=1;i<=a;i++)
{
if(i==1||i==a)
for(j=1;j<=b;j++)
cout<<"*";
else
for(k=1;k<=b;k++)
if(k==1||k==b)
cout<<"*";
else
cout<<" ";
cout<<endl;
}
}
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定義常數(shù)
#include <iostream>
using namespace std;
#include <math.h>
#define BMI(h,w) w/pow(h/100.0,2)
int main()
{
cout<<BMI(172,68)<<endl;
system("pause");
return 0;
}
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使用define定義價錢
Menu()列印選單
total(項目,數(shù)量)計算小計
sum=0定義全域變數(shù)
#include <iostream>
using namespace std;
#define red 20
#define green 25
#define coffee 45
int sum=0; //總計
void Menu();
int total(int ,int );
int main()
{
int item,qty;
do{
Menu();
cin>>item;
if(item>=1 && item<=3)
{ cout<<"數(shù)量:";
cin>>qty;
}
cout<<total(item,qty)<<"元"<<endl;
}while(item!=4);
system("pause");
return 0;
}
void Menu()
{
cout<<"1.紅茶"<<red<<"元"<<endl;
cout<<"2.綠茶"<<green<<"元"<<endl;
cout<<"3.咖啡"<<coffee<<"元"<<endl;
cout<<"4.結束"<<endl;
cout<<"請選擇:";
}
int total(int item,int qty)
{
switch(item)
{
case 1:
sum+=red*qty;
break;
case 2:
sum+=green*qty;
break;
case 3:
sum+=coffee*qty;
break;
case 4:
cout<<"總計:"<<sum<<"元"<<endl;
system("pause");
return 0;
}
return sum;
}
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指標
#include <iostream>
using namespace std;
int main()
{
int a=7;
int *p; //指標
p=&a; //儲存a變數(shù)記憶體位址 ,p指標指向a變數(shù)
cout<<a<<" "<<*p<<endl;
cout<<p<<endl; //位址
*p+=5;
cout<<a<<endl;
int b=23;
p=&b;
cout<<*p<<endl;
cout<<p<<endl;
system("pause");
return 0;
}
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#include <iostream>
using namespace std;
int main()
{
int *p=new int;
*p=15;
cout<<*p<<endl;
int *k; //宣告
k=new int;
*k=100;
cout<<*k<<endl;
double *x=new double;
*x=10.7;
cout<<*x<<endl;
system("pause");
return 0;
}
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//指標與陣列
#include <iostream>
using namespace std;
int main()
{
int var[]={7,3,2,1};
int sum=0,i;
for(i=0;i<4;i++)
{
cout<<*(var+i)<<endl;
sum+=*(var+i); //指標寫法
// sum+=*var++; //錯誤,不可以改變陣列的起始位址
}
cout<<sum<<endl;
system("pause");
return 0;
}
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//指標與陣列
#include <iostream>
using namespace std;
int main()
{
int var[]={7,3,2,1};
int sum=0,i;
int *p;
p=var;
for(i=0;i<4;i++)
{
cout<<*p<<endl;
sum+=*p; //sum+=*p++;
p++;
}
cout<<sum<<endl;
system("pause");
return 0;
}
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#include <iostream>
using namespace std;
int main()
{
int *a=new int;
int *b=new int;
int *c=new int;
cout<<"input a,b:";
cin>>*a>>*b;
*c=*a+*b;
cout<<*c<<endl;
system("pause");
return 0;
}
using namespace std;
int main()
{
int *a=new int;
int *b=new int;
int *c=new int;
cout<<"input a,b:";
cin>>*a>>*b;
*c=*a+*b;
cout<<*c<<endl;
system("pause");
return 0;
}
