1 #include<iostream>
 2 using namespace std;
 3
 4 inline int max(int a,int b);
 5
 6 int main()
 7 {
 8     int a=21,b=15,c=22,d,e;
 9     d=max(a,b);
10     e=max(d,c);
11     cout<<"在21,15,22之中最大的是:"<<e<<endl;
12     return 0;
13 }
14
15 int max(int a,int b)
16 {
17    return (a>b)?a:b;
18 }

 1 #include<iostream>
 2 using namespace std;
 3
 4 void overload (int a);
 5 void overload (char b);
 6
 7 int main()
 8 {
 9     int x;
10     char y;
11     cout<<"请输入X的值：";
12     cin>>x;
13     overload(x);
14     cout<<endl<<"请输入y的值：";
15     cin>>y;
16     overload(y);
17     return 0;
18 }
19
20 void overload(int a)
21 {
22     cout<<"你输入的数值为："<<a<<endl;
23 }
24
25 void overload(char b)
26 {
27     char i;
28     i=b+1;
29     cout<<"你输入的字符为："<<i<<endl;
30 }

 1 #include<iostream>
 2
 3 using namespace std;
 4 #include<math.h>
 5
 6 class triangle
 7 {
 8     private:
 9     int a,b,c;
10
11     public:
12     triangle(int x=0,int y=0,int z=0);
13     static void perimeter(triangle a);
14     static void area(triangle b);
15 };
16
17 int main()
18 {
19     triangle  M(3,4,5);
20     M.perimeter(M);
21     M.area(M);
22     return 0;
23 }
24
25 triangle::triangle(int x,int y,int z)
26 {
27     a=x;
28     b=y;
29     c=z;
30 }
31
32 void triangle::perimeter(triangle a)
33 {
34     int h;
35     h=a.a+a.b+a.c;
36     cout<<"三角形周长为："<<h<<endl;
37 }
38
39 void triangle::area(triangle b)
40 {
41     float x,s;
42     x=(b.a+b.b+b.c)/2;
43     s=sqrt(x*(x-b.a)*(x-b.b)*(x-b.c));
44     cout<<"三角形面积为："<<s<<endl;
45 }

 1 #include<iostream>
 2 using namespace std;
 3
 4 class rectangle
 5 {
 6     private:
 7     int a,b;
 8     public:
 9     rectangle(int x=0,int y=0);
10     void perimeter(rectangle i);
11     void area(rectangle j);
12 };
13
14 int main()
15 {
16     rectangle ob1(3,5);
17     ob1.perimeter(ob1);
18     ob1.area(ob1);
19     return 0;
20 }
21
22 rectangle::rectangle(int x,int y)
23 {
24     a=x;
25     b=y;
26 }
27
28 void rectangle::perimeter(rectangle i)
29 {
30     int a;
31     a=2*(i.a+i.b);
32     cout<<"矩形的周长为："<<a<<endl;
33 }
34
35 void rectangle::area(rectangle j)
36 {
37     int b;
38     b=j.a*j.b;
39     cout<<"矩形的面积为:"<<b<<endl;
40 }

 1 #include<iostream>
 2 using namespace std;
 3
 4 class circle
 5 {
 6     private:
 7     int r;
 8     public:
 9     circle(int x);
10     void perimeter(circle a);
11     void area(circle b);
12 };
13
14 int main()
15 {
16     circle ob1(1);
17     ob1.perimeter(ob1);
18     ob1.area(ob1);
19     return 0;
20 }
21
22 circle::circle(int a)
23 {
24     r=a;
25 }
26
27 void circle::perimeter(circle a)
28 {
29     float z;
30     z=2*3.14*a.r;
31     cout<<"圆的周长为："<<z<<endl;
32 }
33
34 void circle::area(circle b)
35 {
36     float c;
37     c=3.14*b.r*b.r;
38     cout<<"圆的面积为:"<<c<<endl;
39 }