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法律编写一个展示指针示例的 C 程序
指针是指向另一个变量的地址的变量。
指针的特征
指针可节省内存空间。
由于直接访问内存位置，指针执行速度更快。
借助指针，可以有效地访问内存，即动态地分配和释放内存。
指针与数据结构一起使用。
声明指针
int *p;
表示“p”是一个指向另一个整数变量地址的指针变量。
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;
通过其指针访问变量
使用间接运算符 (*) 访问变量的值。
程序
#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//
}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
更新于： 06-3-2021
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