typedef

1. primitive

typedef int Integer;

Integer i;

 

2. array

typedef int Arr[10];

Arr a, b, c;

 

3. function pointer

#include<stdio.h>

 

typedef int (*pfn)(int, int);

 

void main()

{

int max(int, int);

pfn p;

p = max;

printf("%d\n", (*p)(2,3));

}

 

How to define typedef?

a. write down the original clause(eg: int i);

b. change the variable name to new type(eg: i -> count), now is 'int count';

c. add 'typedef' in the front, now is 'typedef int count';

d. define int variable with new defined type(eg: count n, m, k;).