C lang: Pointer

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C lang:Pointer and multidimensional array

Xx_Introduction Double indrection:Address of Address;Pointer of Pointer Ax_Code #include<stdio.h> int main(void) { int zippo[4][2] = { 2,4, 6,8, 1,3, 5,7 }; printf(" zippo = %p, zippo + 1 = %p\n", zippo, zippo + 1); printf(" zippo[0]…

C lang:Pointer operation

Xx_Pointer opteration Do not dereference initialized Pointers Ax_Code #include<stdio.h> int main(void) { int urn[5] = { 100, 200, 300, 400, 500 }; int * ptr1, *ptr2, *ptr3; int a =2; ptr1 = urn; // equal to &urn[0] ptr2 = &urn[2]; printf(&qu…

C lang:Pointer and Array

Xx_Introduction Point and Array germane. Xx_Code #include<stdio.h> #define SIZE 4 int main(void) { short arra[SIZE]; short * a; double arrb[SIZE]; int i; double * b; a = arra; b = arrb; for (i = 0; i < SIZE; i++) printf("%d %p %p \n",i…

Ax_Terminology xa_pointer pointer is the address used to store the variable;A variable (or data object) whose value is a memory address Bx_Operator xa_indirection operator(*) xb_address operator(&) Cx_Program xa_not use pointer #include <stdio.h>…

JDK1.6 Java.lang.Null.Pointer.Exception

先来看一下JDK1.6的API: NullPointerException (Java Platform SE 6) public class NullPointerException extends RuntimeExceptionnull 当应用程序试图在需要对象的地方使用时,抛出该异常.这种情况包括: * 调用 null 对象的实例方法. * 访问或修改 null 对象的字段. * 将 null 作为一个数组,获得其长度. * 将 null 作为一个数组,访问或修改其时间片. * 将 nu…

C lang:Array and Pointer formal parameter

Test Xx_Formal parameter Formal parameter are local variable. It's private to the function. Ax_Array formal parameter #include<stdio.h> #define SIZE 10 int sum(int ar[], int n); int main(void) { int marbles[SIZE] = {20, 10, 5, 39, 4, 16, 19, 26, 31,…

J2SE 1.6 特性：java.lang.instrument

1. import java.lang.instrument.Instrumentation; public class ObjectSizeFetcher { private static Instrumentation instrumentation; public static void premain(String args, Instrumentation inst) { instrumentation = inst; } public static long getObjectSiz…