C语言程序设计 课件 ch8.pptx

指针;地址和指针;内存地址;变量与地址;指针;变量与指针;指针变量的定义和初始化;定义指针变量;初始化指针变量;指针基本运算;取地址运算和间接运算;综合实例1;#include stdio.hint main(){ int a, b, *p, *p1 = a, *p2 = b; scanf(%d%d, a, b); if (a b) { p = p1, p1 = p2, p2 = p; } printf(a=%d,b=%d\n, a, b); printf(max=%d,min=%d\n, *p1, *p2); return 0;};赋值运算;比较运算;算术运算;通用指针;指针类型转换;通用指针;注意事项;使用const修饰指针;const在指针声明符*的左边;const在指针声明符*的右边;const同时在指针声明符*的左边与右边;指针作为函数参数;基本概念;void swap1(int x, int y){ int t; t = x, x = y, y = t; // 只交换形参值，实参值不变}void swap2(int *x, int *y){ int *t; t = x, x = y, y = t; // 只交换形参指针，实参指针不变，实参指向内容也不变}void swap3(int *x, int *y){ int t; t = *x, *x = *y, *y = t; // 交换形参指针所指内容，从而交换实参所指内容};综合实例2;#include stdio.hvoid zip(char *p);int main(){ char line[80]; gets(line); zip(line); puts(line); return 0;};void zip(char *p){ char *q = p; int n; while (*p) { for (n = 1; *p == *(p + n); n++); //统计连续重复字符个数 if (n = 10) //当n=2时需要转化为字符 { *q++ = n / 10 + 0; } if (n = 2) { *q++ = n % 10 + 0; } *q++ = *(p + n - 1); p += n; } *q = \0;};指针、数组和地址;一维数组;二维数组;字符串常量和字符指针;字符串常量;字符数组与字符指针;综合实例3;综合实例4;二级指针、指针数组和数组指针;指针数组;命令行参数;#include stdio.hint main(int argc, char *argv[]){ int i; printf(argc=%d\n, argc); for (i = 0; i argc; i++) { printf(%s\n, argv[i]); } return 0;};数组指针;二级指针;当把一维指针数组名赋给二级指针时，二级指针可以起到和一维指针数组名类似的作用 #include stdio.hint main(){ char *p[5] = {red, green, blue, black, white}; char **pp = p; printf(%s,%s,%s,%s,%s\n, p[0], p[1], p[2], p[3], p[4]); printf(%s,%s,%s,%s,%s\n, pp[0], pp[1], pp[2], pp[3], pp[4]); return 0;};指针函数和函数指针;指针函数;函数指针;#include stdio.hint max(int a, int b){ return a b ? a : b;}int main(){ int x, y, maxval; int (*pmax)(int, int) = max; //也可写作int (*pmax)(int a, int b) scanf(%d%d, x, y); maxval = (*pmax)(x, y); /