指針是一個存儲另一個變量地址的變量。
指針的特點
指針節(jié)省內存空間。
由于直接訪問內存位置，指針的執(zhí)行時間更快。
在指針的幫助下，內存被有效地訪問，即動態(tài)分配和釋放內存。
指針與數(shù)據(jù)結構一起使用。
聲明一個指針
int *p;
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這意味著“p”是一個指針變量，它保存另一個整型變量的地址。
指針的初始化
地址運算符（&）用于初始化指針變量。
例如，
int qty = 175; int *p; p= &qty;
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通過變量訪問變量指針
要訪問變量的值，請使用間接運算符 (*)。
程序
?現(xiàn)場演示
#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",sizeof (int));//4//
printf("Address of %d is %d
",a,p);//Address value//
printf("Value of %d is %d
",a,*p);//2//
printf("Value of next address location of %d is %d
",a,*(p+1));//Garbage value from (p+1) address//
printf("Address of next address location of %d is %d
",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
",sizeof(char));//1//
printf("Address of %d is %d
",a,p0);//Address Value(p)//
printf("Value of %d is %d
",a,*p0);//First byte of value a - 2//
printf("Value of next address location of %d is %d
",a,*(p0+1));//Second byte of value a - 0//
printf("Address of next address location of %d is %d
",a,(p0+1));//Address value(p)+1//
}
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輸出
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
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