1 #include<iostream>
 2 using namespace std;
 3 void swap(int *p,int *q)
 4 {
 5     int temp;
 6     temp=*p;
 7     *p=*q;
 8     *q=temp;
 9 }
10 int main()
11 {
12 int a,b;
13 cin>>a>>b;
14 cout<<"the num is :"<<a<<b<<endl;
15 swap(a,b);//swap(&a,&b);
16 cout<<"the sorted num is :"<<a<<b<<endl;
17 }

1 #include<stdio.h>
 2 #include<stdlib.h>
 3 void *bbb(int *p1)
 4 {
 5     int i=0;
 6     while(i<4)
 7     {
 8         *p1+=1;
 9         *p1++;
10         i++;
11     }
12 }
13 void main()
14 {
15     int a[4]={1,2,3,4};
16     bbb(a);
17     int i=0;
18     while(i<4)
19     {
20         printf("%d\t",a[i]);
21         i++;
22     }
23 }

1 #include<stdio.h>
 2 #include<stdlib.h>
 3 int aaa(int a[])
 4 {
 5     return a;
 6 }
 7 void main()
 8 {
 9     int *p;
10     int a[4]={1,2,3,4};
11     p=aaa(a);
12     int i=0;
13     while(i<4)
14     {
15         printf("%d\t",a[i]);
16         i++;
17     }
18 }

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 int aaa(int *p)
 4 {
 5     int i=0;
 6     while(i<4)
 7     {
 8         *p+++=1;
 9         i++;
10     }
11     return p;
12 }
13 void main()
14 {
15     int *px;
16     int a[4]={1,2,3,4};
17 
18     px=aaa(a);
19     int i=0;
20     while(i<4)
21     {
22         printf("%d\t",a[i]);
23         i++;
24     }
25 }