我的想法
C 语言里非常有意思的一个思想，数组
Definition
A simple data type can only store one value at a time.
We could use int *A or int A[] to represent an array.
This indicates a very important thinking: an Array is also a Pointer
Question: What is the difference between
int A[]andint A[n]?
Answer: in
int A[]we don’t know the exact size of the array, but inint A[n], the size is exactly n.
- In C, array indexes are integers ==beginning at =0== and counting up
A[0]means the first element
For an array that contains 10 element, the array index could be 0-9 Manipulating array element is very simple , just need to know and understand the definition of Array and Array index.
How to accessing array elements?
Use for Loop!
Foe example:
#define SIZE 11
int i, squeare[size];
for (i=0;i<SIZE;i++)
square[i]=i * i;数组的有效下标范围
It could be segmentation fault
PS: We can create an array that contains no position, that is A[0] but it is meaningless
Practice ：
写一个程序，输入数量不确定的 (0 , 9) 范围内的整数，统计每一种数字出现的次数，输入-1 表示结束
自己动手：
#include<stdio.h>
int main(){
int x;
scanf("%d", &x);
}Important
Always remember that once the Array is declared, we can’t change the size of it.