C語言第7章指針第1講ppt課件

1、2022-4-2922022-4-2932022-4-2942022-4-295 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 2022-4-2962022-4-2972022-4-298int *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

2、賦值量之間賦值2022-4-2992022-4-29102022-4-29112022-4-29126000600160026003600460056006p-1pp+12022-4-29132022-4-29142022-4-2915錯(cuò)！但TC下不報(bào)錯(cuò)VC下報(bào)錯(cuò)2022-4-29162022-4-2917void 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); y

3、= temp;main() int a, b; a = 15; b = 8; Swap(a, b); printf(a=%d,b=%d,a,b);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 參參2022-4-2918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 參參99xyabxy55temp92022-4-2919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&bxyabxy5temp5ab9952022-4-292015 815 815 81515 8815 81515a) 調(diào)用Swap函數(shù)(b)執(zhí)行

4、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Swap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) temptemp2022-4-29212022-4-29222022-4-29232022-4-29242022-4-29252022-4-29262022-4-2927下標(biāo)： 0 1 2 3 4 5 6 7 8 9 10 11 HelloChina0H

5、elloChina0srcStridstStri下標(biāo)移動(dòng)方向dstStri=0srcStrdstStr完畢拷貝ii+ i 2022-4-2928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*srcStr*dstStr指針移動(dòng)方向指針移動(dòng)方向*to=0dstStrsrcStr+srcStrsrcStrdstStr+dstStr2022-4-29292022-4-29302022-4-293160006001600260036004600560066007a

6、0a1a2a3aa+1a+260006001600260036004600560066007a0a1a2a3app+p+2022-4-29322022-4-2933 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 a52022-4-29342022-4-29352022-4-29362022-4-29372022-4-29382022-4-29392022-4-2940a00a01a02a10a11a12aa0+0a+1a1+0a0+1a0+2&a00&a10&

7、;a11a1+1&a12&a01&a02 a00 a0a01a02a10 a1 a11a12 a a1+22022-4-2941weekDay0weekDay1weekDay2weekDay3weekDay4weekDay5weekDay6Sunday0Monday0Tuesday0Wednesday0Thursday0Friday0Saturday02022-4-2942weekDay0weekDay1weekDay2weekDay3weekDay4weekDay5weekDay6Sunday0Monday0Tuesday0Wednesday0Thursday0Friday0Saturday0 xSunday02022-4-29432022-4-2944a00a01a02a10a11a12pp+2022-4-2945a00a01a02a10a11a12pp+2022-4-2946能返回這兩個(gè)值嗎？能返回這兩個(gè)值嗎？2022-4-2947指針參數(shù)指定了存放指針參數(shù)指定了存放這