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Xx_Introduction
Point and Array germane.
Xx_Code
#include<stdio.h>
#define SIZE 4
int main(void)
{
short arra[SIZE];
short * a;
double arrb[SIZE];
int i;
double * b;
a = arra;
b = arrb;
for (i = 0; i < SIZE; i++)
printf("%d %p %p \n",i ,a + i,b + i);
return 0;
}
Ax_Address and Value
dates + 2 == &dates[2]; //true address
*(dates + 2) == dates[2]; //true value
*dates + 2 = (*dates) + 2; // Beause '*' > '+'
<<<<<<<<<<"I am the dividing line ">>>>>>>>>>>>
Bx_Replace
x-a not use pointer
#include<stdio.h>
#define M 12
int main(void)
{
int days[M] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
int i;
for (i = 0; i < M; i++)
printf("Month %2d has %2d days.\n", i + 1, days[i]);
return 0;
}
x-b use pointer
#include<stdio.h>
#define M 12
int main(void)
{
int days[M] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
int i;
for (i = 0; i < M; i++)
printf("Month %2d has %2d days.\n", i + 1, *(days + i)); // equal to days[i]
return 0;
}
x-c Notice
V.V(vice versa)Use arrays to represent Pointers,but attention toWhen an array is a function of an argument.
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