副本(1)第7章 指針

1、23456 0 內(nèi)存用戶數(shù)據(jù)區(qū) 2000 3 變量 i 2002 6 變量 j 2004 9 變量 k 3010 2000 變量 i_pointer 789int i,*p；p=&i;int *p;float *q;p=q;int i;float *p;p=&i;int *p;p=100;指針變量只指針變量只存放地址存放地址!一個(gè)指針變量不能一個(gè)指針變量不能指向與其類型不同指向與其類型不同的變量的變量!我是真的，我是真的，你猜對(duì)了嗎？你猜對(duì)了嗎？應(yīng)在類型相應(yīng)在類型相同的指針變同的指針變量之間賦值量之間賦值101112136000600160026003600460056006p

2、-1pp+1141516錯(cuò)！但TC下不報(bào)錯(cuò)VC下報(bào)錯(cuò)1718void Swap(int *x,int *y) int temp; temp = *x; *x = *y; *y = temp;main() int a, b; a = 15; b = 8; Swap( &a, &b ); printf( a=%d,b=%d ,a,b);void Swap(int x,int y) int temp; temp = x; x = y; y = temp;main() int a, b; a = 15; b = 8; Swap(a, b); printf( a=%d,b=%d ,a,b

3、);程序程序 1程序程序 2 主調(diào)函數(shù)主調(diào)函數(shù)被調(diào)被調(diào)函數(shù)函數(shù)實(shí)實(shí) 參參形形 參參19主調(diào)函數(shù)主調(diào)函數(shù)被調(diào)函數(shù)被調(diào)函數(shù)55ab實(shí)實(shí) 參參形形 參參99xyabxy55temp920主調(diào)函數(shù)主調(diào)函數(shù)被調(diào)函數(shù)被調(diào)函數(shù)&a&a實(shí)實(shí) 參參形形 參參&b&bxyabxy5temp5ab9952115 815 815 81515 8815 81515a) 調(diào)用Swap函數(shù)(b)執(zhí)行Swap函數(shù)c) 從Swap函數(shù)返回temp xy bmain函數(shù)Swap函數(shù)aaatemptempxxy y bb1588 15&a&b&a&b15(a) 調(diào)用S

4、wap函數(shù) (b) 執(zhí)行Swap函數(shù) a a b b *x *x *y *y y y x x &a &b main函數(shù) Swap函數(shù) temptemp22232425262728下標(biāo)： 0 1 2 3 4 5 6 7 8 9 10 11 HelloChina0HelloChina0srcStridstStri下標(biāo)移動(dòng)方向dstStri=0srcStrdstStr結(jié)束拷貝ii+ i 29當(dāng)只允許函數(shù)訪問地址內(nèi)容，不允許修改當(dāng)只允許函數(shù)訪問地址內(nèi)容，不允許修改時(shí)，可以把函數(shù)的指針參數(shù)定義為時(shí)，可以把函數(shù)的指針參數(shù)定義為constHelloChina0HelloChina0*srcS

5、tr*dstStr指針移動(dòng)方向指針移動(dòng)方向*to=0dstStrsrcStr+srcStrsrcStrdstStr+dstStr303160006001600260036004600560066007a0a1a2a3aa+1a+260006001600260036004600560066007a0a1a2a3app+p+3233 1 3 5 7 9a0 a1 a2 a3 a4 a5插入位置pos x=4x插入前： 1 3 4 5 7 9 x插入后：插入元素xa0 a1 a2 a3 a4 a53435a00a01a02a10a11a12aa0+0a+1a1+0a0+1a0+2&a00&a

6、mp;a10&a11a1+1&a12&a01&a02 a00 a0a01a02a10 a1 a11a12 a a1+2 a23;36weekDay0weekDay1weekDay2weekDay3weekDay4weekDay5weekDay6Sunday0Monday0Tuesday0Wednesday0Thursday0Friday0Saturday037weekDay0weekDay1weekDay2weekDay3weekDay4weekDay5weekDay6Sunday0Monday0Tuesday0Wednesday0Thursday0Friday

7、0Saturday0 xSunday03839a00a01a02a10a11a12pp+40a00a01a02a10a11a12pp+41能返回這兩個(gè)值嗎？能返回這兩個(gè)值嗎？42指針參數(shù)指定了存放指針參數(shù)指定了存放這兩個(gè)值的地址這兩個(gè)值的地址43能這樣傳遞能這樣傳遞m個(gè)班（每個(gè)班（每班班n個(gè)學(xué)生）的成績(jī)嗎？個(gè)學(xué)生）的成績(jī)嗎？44指定存儲(chǔ)指定存儲(chǔ)m個(gè)班（每班個(gè)班（每班n個(gè)學(xué)生）成績(jī)的首地址個(gè)學(xué)生）成績(jī)的首地址454647strPascalBasicFortranJava二維數(shù)組二維數(shù)組字符串字符串Visual C48PascalBasicFortranJavaptr指針數(shù)組指針數(shù)組字符串字符串p

8、trVisual C49 name0 P a s c a l 0 0 0 0 name1 B a s i c 0 0 0 0 0 name2 F o r t r a n 0 0 0 name3 J a v a 0 0 0 0 0 0 name4 V i s u a l C 0 0 name0 B a s i c 0 0 0 0 0 name1 F o r t r a n 0 0 0 name2 J a v a 0 0 0 0 0 0 name3 P a s c a l 0 0 0 0 name4 V i s u a l C 0 0 50 指針數(shù)組指針數(shù)組ptr 字符串排序前字符串排序前Pascal0Basic0Fortran0Java0Visual C0ptr0ptr1ptr2ptr3ptr4 指針數(shù)組指針數(shù)