第1章 C++初步

2
1.1 C++
1.2 C++
1.3 VC++
3
1.1 C++ ——
? C++ C
C
? C++
C”
? 1983 C++
? 1989 C++
? 1994 ANSI C++
? 1998 11 ISO
C++
4
C++
? C
? C
? C
? C++
JAVA
?
5
C++ C plus plus C
C C
C++
C++
C++ C
6
?
?
?
? const
? void
7
?
?
void display (int, char *, float);
int mixture (int, float, char *);
8
? C
int m,n,k;
m=10;n=9;
k=m*n;
….
C++
int m,n,k;
m=10;n=9;
k=m*n;
….
int x,y;
y=k+m;
…
9
? C++ C
—
iostream.h”
?
#include
int x,y;
float z;
cin>>x>>y>>z; //
char *str=“Hello, how are you ;
cout<<“Please output the info of the
string:”< ?
#include
int x,y;
float z;
cin>>x>>y>>z; //
char *str=“Hello, how are you ;
cout<<“Please output the info of the
string:”< 10
? C #define C++
const const C++
1. #define
#define MAX 100
const int MAX=100; int const MAX=100;
2.
const float data[ ]={1.2,2.5,3.6,4.8,5.5};
11
3. const
void print_value(const int value)
{
cout< }
const value
12
4. const
13
? void
void
: void fun ( int * );
? void
int graph (void);
? C C++
void
C++
14
1.1 This is a C program.”
#include // cout
using namespace std;// std
int main( )
{
cout <<“This is a C program.\n”< // C
return 0;
}
This is a C program.
#include
// VC++
15
C++
*.CPP *.OBJ
*.EXE
Vitual C++
*.OBJ *.EXE
F7
compile link
16
C++
#include
void main(void )
{ cout<<“I am a student.\n”; //
}
DOS
I am a student.
17
? C++
C++
main()
?
1 C++ main
void
2
? //”
? /*” */”
18
C++
1.2 a b
//
#include // cout
using namespace std // std
int main //
{ int a b sum //
cin >> a >> b //
sum = a + b
cout <<“a + b =”<< sum << endl //
return 0
}
: 18 25 ( 18 25 a b),a b
19
1.3
#include
using namespace std;
int main()
{ int max(int x,int y);
// max
int a,b,c;
cin>>a>>b;
c=max(a,b); // max
cout<<"max="< return 0;
}
// max
int max(int x,int y)
{ int z;
if(x>y) z=x
else z=y;
return(z);
}
20
1.4 C++
#include
using namespace std;
class Student // Student
{private: //
int num; // num
int score; // score
public: //
void setdata() // setdata
{cin>>num; // num
cin>>score; // score
}
void display() // display
{cout<<"num="< cout<<"score="< };
}; //
21
1.4 C++
Student stud1,stud2; // stud1 stud2
int main() //
{stud1.setdata(); // stud1 setdata
stud2.setdata(); // stud2 setdata
stud1.display(); // stud1 display
stud2.display(); // stud1 display
return 0;
}
22
1.3 VC++
1 Visual C++, Files”
New” Files” C++
Source File”
2
OK”
3
4 F7 Compile” Build”
Excute” DOS
23
VC++
24
VC++
File”
New”
25
Files”
C++
26
C++
C++
27
28
.cpp .obj
29
30
31
32
33
DOS
!
34
35
Debug
36
Debug
obj EXE
37
38
? C++ C
const
void
? C++
? VC++