c++源码基础（反思02）

//***************************************

#include

using namespace std;

int main()
{
int a=0;
int b=0;
a++;
b++;
cout<<"a="< {
float a=0.5;
a++;
b++;
cout<<"a="< }
a++;
b++;
cout<<"a="< return 0;
}

//****************************************

#include
using namespace std;
int main()
{
double flag;
flag=true;
cout<<"flag= "< return 0;
}
//*******************************************

#include

using namespace std;
int main()
{
char ch1;
ch1='a';
cout<<"ch1= "< int ch2;
ch2='a';
cout<<"ch2= "< return 0;
}
//*********************************************

#include
using namespace std;
int main()
{
double a;
a=3.14159265;
cout<<"a= "< return 0;
}
//****************************************

#include

using namespace std;
int main()
{
const double pi=3.141592635898;
const double radius=8.5;
cout<<"area of circle of radius:"< cout<<"niihao"<<"\n";
return 0;
}
//****************************************

#include

using namespace std;
int main()
{
char ch;
ch='a';
int i;
i=(int)ch;
cout<<"ch= "< cout< return 0;
}
//****************************************

#include

using namespace std;
int main()
{
char ch;
ch='a';
int i=ch;
cout<<"ch= "< cout<<"i= "< return 0;
}
//***************************************

#include

using namespace std;
int main()
{
const double pi=3.141592635898;
double radius;
double area;
cout<<"please input radius:"< cin>>radius;
area=pi*radius*radius;
cout<<"area of radius:"<< radius<<" is "< return 0;
}
//*********************************************

#include

using namespace std;
#define M -1
int main()
{
int x,y;
cout<<"请输入一个整数:"< cin>>x;
char c;
c="\41";
if(x {
y=M*x+1;
}
else
y=(x+M)*x-3;
cout<<"x= "< cout<<"y= "< printf("%d\n",c);
return 0;
}
//*****************************************