資料結構
網路
RDBMS
作業系統
Java
MS Excel
iOS
HTML
CSS
Android
Python
C 程式設計
C++
C#
MongoDB
MySQL
Javascript
PHP
物理學
化學
生物學
數學
英語
經濟學
心理學
社會科學
時尚研究
法律研究使用 C 語言演示指標的概念
指標是一個儲存另一變數地址的變數。
指標的語法如下 −
pointer = &variable;
示例
以下是使用 C 語言演示指標概念的 C 程式 −
#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//
}輸出
當執行上述程式時，將生成以下結果 −
Size of the integer is 4 Address of 2 is 6422028 Value of 2 is 2 Value of next address location of 2 is 463824 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
更新於： 08-03-2021
554 次瀏覽
廣告