函数指针基本用法
1.基本用法
#include <stdio.h>int add(int x, int y) {return(x + y);}int sub(int x, int y) {return(x - y);}int mul(int x, int y) {return(x * y);}int div(int x, int y) {return(x / y);}int main(void){ int (*pf)(int, int); pf = add; printf("%dn", pf(9, 3)); /* 12 */ pf = sub; printf("%dn", pf(9, 3)); /* 6 */ pf = mul; printf("%dn", pf(9, 3)); /* 27 */ pf = div; printf("%dn", pf(9, 3)); /* 3 */ getchar(); return 0;}2.函数指针数组
#include <stdio.h>int add(int x, int y) {return(x + y);}int sub(int x, int y) {return(x - y);}int mul(int x, int y) {return(x * y);}int div(int x, int y) {return(x / y);}int main(void){ int (*pf[4])(int, int) = {add, sub, mul, div}; printf("%dn", pf[0](9, 3)); /* 12 */ printf("%dn", pf[1](9, 3)); /* 6 */ printf("%dn", pf[2](9, 3)); /* 27 */ printf("%dn", pf[3](9, 3)); /* 3 */ getchar(); return 0;}3.函数指针做参数
#include <stdio.h>int add(int x, int y) {return(x + y);}int sub(int x, int y) {return(x - y);}int mul(int x, int y) {return(x * y);}int div(int x, int y) {return(x / y);}int math(int(*pfun)(int, int), int x, int y) { return pfun(x, y);}int main(void){ printf("%dn", math(add, 9, 3)); /* 12 */ printf("%dn", math(sub, 9, 3)); /* 6 */ printf("%dn", math(mul, 9, 3)); /* 27 */ printf("%dn", math(div, 9, 3)); /* 3 */ getchar(); return 0;}