C language pointer program runs, how to do this C language pointer programming?

After testing, ** runs OK, and only 1 place is modified.

#include

int a[10]=;Global array.

rev (int *m, int n) is a recursive function that reverses an integer array.

int t;

if(n>1) is performed if n is greater than 1.

t=*m;t is an intermediate variable.

m=*(m+n-1);The value that the current pointer points to is equal to the last 1 value.

m+n-1)=t;

rev(m+1,n-2);

If the call continues recursively, it should be swapped, then the pointer is moved back by one bit, and the length is minus 2main().

int i;

rev(a,7);

for(i=0;i<7;i++) According to the title, it should be 7, and if it is 10, there will be 3 zeros

printf("%d",a[i]);

printf("");

The rev (int *m, int n) function swaps the array element pointed to by the pointer m with the n-1st element that follows it.

int t;t is the temporary variable if(n>1) executed if n is greater than 1, recursively controlling the condition. }main()

rev (int *m, int n) This function is a recursive function, it should be in reverse order.

The pointer is not allocated memory, and the segfault is made.

The program written according to the requirements of the question is as follows (see figure).

Here's how I understand it:

In C, you need to define a variable, and you need to understand two meanings of the variable itself

1) What is the value in the variable? With the value, we can directly take the variable and participate in the operation, eg int a=5;A means 5 when calculating;

2) Where are variables stored in memory? The storage location of the variable is the address of the variable, so this address can be stored with a pointer, eg int a=5, *p=&a;Here p is the pointer variable, which stores the address of variable a, at this time, if you use the value of the a variable, you can directly use a, or you can use *p, *p is through the pointer of p (that is, the address of a), indirectly find a, in the program *p and a are equivalent.

The pointer points to the address, so your modification of the pointer will also affect the value of the original address, so when you need to modify the variable outside the function in the function, you can consider the pointer, of course, the pointer can also connect the nodes in the structure and the like, and there are functions related to the follow-up, as long as you figure it out, you will understand.

A pointer can be understood as an address, that is, a pointer to an address, and there are three questions to be clarified before using it, the type of pointer, the type of pointer pointing, and the memory area of the pointer pointing to the value. The value is passed by passing the address of the value.

It is the address of the address, and then we will learn that the pointer function is the function parameter is the pointer type, we usually learn int, float, etc., and we will also learn that the function pointer is the address of the call function.