第 4 章(2)━━指针和数组.ppt
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C++程序设计;主要内容;指针的概念;【例】
#includeiostream.h
void main ( )
{ int a = 3 ;
double b = 5.6 ;
char c = ‘A’ ;
cout “a的地址=” a “\ta的内容=” a ;
cout “\t字节数=” sizeof( a ) endl ;
cout “a=” *a endl ;
cout “b的地址=” b “\tb的内容=” b ;
cout “\t字节数=” sizeof( b ) endl ;
cout “b=” *b endl ;
cout “c的地址=” c “\tc的内容=” c ;
cout “\t字节数=” sizeof( c ) endl ;
cout “c=” *c endl ;
};指针变量的定义和使用;指针变量的定义和使用;指针变量的定义和使用;【例】
#includeiostream.h
void main ( )
{ int a1 = 3 , a2 = 7 , *pa = a1 ;
double b1 = 5.6 , *pb = b1 ;
float b2 = 3.7 ;
cout “a1：\t地址=” pa “\t内容=” *pa endl ;
cout “pa：\t地址=” pa “\t内容=” pa endl ;
pa = a2 ;
cout “a2：\t地址=” pa “\t内容=” *pa endl ;
cout “pa：\t地址=” pa “\t内容=” pa endl ;
cout “b1：\t地址=” pb “\t内容=” *pb endl ;
cout “pb：\t地址=” pb “\t内容=” pb endl ;
pb = ( double * ) b2 ; //写成 pb = b2 为何编译通不过？
cout “b2：\t地址=” pb “\t内容=” *pb endl ;
cout “pb：\t地址=” pb “\t内容=” pb endl ; };指针的赋值运算;指针的赋值运算;指针的算术运算;指针的算术运算;指针的关系运算;【例】
#includeiostream.h
void main ( )
{ int x[ 8 ] = { 2 , 8 , 3 , 7 , 9 , 4 , 6 , 1 } ;
int a=10 , b=20 , *p1 = b , *p2 = x[ 0 ] ;
char c[ 8 ] = “ABCDEF” , *p3 = c ;
cout “*p1=” *p1 “\tp1=” (int) p1 endl ;
p1++ ;
cout “*p1=” *p1 “\tp1=” (int) p1 endl ;
cout “*p2=” *p2 “\tp2=” (int) p2 endl ;
p2 += 4 ;
cout “*p2=” *p2 “\tp2=” (int) p2 endl ;
p2 -= 2 ;
cout “*p2=” *p2 “\tp2=” (int) p2 endl ;
cout “*p3=” *p3 “\tp3=” (int) p3 endl ;
p3++ ;
cout “*p3=” *p3 “\tp3=” (int) p3 endl ;
cout “*p3=” *p3 “\tp3=” p3 endl ;
cout “*p3=” *p3 “\tp3+2=” p3+2 endl ; } ;指针的混合运算;【例】
#includeiostream.h
void main ( )
{ int x[ 8 ] = { 2 , 8 , 3 , 7 , 9 , 4 , 6 , 1 } ;
int *p = x[ 0 ] ;
cout “x[0]=” x[ 0 ] endl ;
cout “p=” (int) p endl ;
cout “*p=” *p endl ;
cout “表达式 (*p)++ 的值=” (*p)++ endl ;
cout “x[0]=” x[ 0 ]
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