指標是一個儲存另一個變數位址的變數。
指標節省記憶體空間。
由於直接存取記憶體位置，指標的執行時間更快。
在指標的幫助下，記憶體被有效地訪問，即動態分配和釋放記憶體。
指標與資料結構一起使用。
int *p;
這表示「p」是一個指標變量，它保存另一個整數變數的位址。
位址運算子（&）用於初始化指標變數。
例如，
int qty = 175; int *p; p= &qty;
要存取變數的值，請使用間接運算子 (*)。
現場示範
#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//
}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
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