指针是一个存储另一个变量地址的变量。
指针的特点
指针节省内存空间。
由于直接访问内存位置，指针的执行时间更快。
在指针的帮助下，内存被有效地访问，即动态分配和释放内存。
指针与数据结构一起使用。
声明一个指针
int *p;
这意味着“p”是一个指针变量，它保存另一个整型变量的地址。
指针的初始化
地址运算符（&）用于初始化指针变量。
例如，
int qty = 175; int *p; p= &qty;
通过变量访问变量指针
要访问变量的值，请使用间接运算符 (*)。
程序
现场演示
#include<stdio.h>
void main(){
//Declaring variables and pointer//
int a=2;
int *p;
//Declaring relation between variable and pointer//
p=&a;
//Printing required example statements//
printf("Size of the integer is %d</p><p>",sizeof (int));//4//
printf("Address of %d is %d</p><p>",a,p);//Address value//
printf("Value of %d is %d</p><p>",a,*p);//2//
printf("Value of next address location of %d is %d</p><p>",a,*(p+1));//Garbage value from (p+1) address//
printf("Address of next address location of %d is %d</p><p>",a,(p+1));//Address value +4//
//Typecasting the pointer//
//Initializing and declaring character data type//
//a=2 = 00000000 00000000 00000000 00000010//
char *p0;
p0=(char*)p;
//Printing required statements//
printf("Size of the character is %d</p><p>",sizeof(char));//1//
printf("Address of %d is %d</p><p>",a,p0);//Address Value(p)//
printf("Value of %d is %d</p><p>",a,*p0);//First byte of value a - 2//
printf("Value of next address location of %d is %d</p><p>",a,*(p0+1));//Second byte of value a - 0//
printf("Address of next address location of %d is %d</p><p>",a,(p0+1));//Address value(p)+1//
}输出
Size of the integer is 4 Address of 2 is 6422028 Value of 2 is 2 Value of next address location of 2 is 10818512 Address of next address location of 2 is 6422032 Size of the character is 1 Address of 2 is 6422028 Value of 2 is 2 Value of next address location of 2 is 0 Address of next address location of 2 is 6422029
