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函数指针的练习函数指针实现冒泡排序的升序和降序#include stdio.h #include stdlib.h #include time.h //正常升序 int shengxu(int* a,int len) { int i0; int j0; for(jlen-1;j0;j--) { for(i0;ij;i) { if(a[i]a[i1]) { int ta[i]; a[i]a[i1]; a[i1]t; } } } return 0; } //函数指针的实现 int asc(int a,int b) { return ab; } int desc(int a,int b) { return ab; } int maopao(int*a,int len,int(*fun)(int,int)) { int i0; int j0; for(jlen-1;j0;j--) { for(i0;ij;i) { if(fun(a[i],a[i1])) { int ta[i]; a[i]a[i1]; a[i1]t; } } } return 0; } int main() { srand(time(NULL)); int a[10]{0}; int i0; for(i0;i10;i) { a[i]rand()%100; printf(%d ,a[i]); } printf(\n); // shengxu(a,

; maopao(a,10,desc); for(i0;i10;i) { printf(%d ,a[i]); } printf(\n); return 0; }用函数指针完成一个函数的加减乘除四则运算#include stdio.h double add(double a,double b) //int (*) (int,int),要变成小数类型double(*)(double,double) { return ab; } double sub(double a,double b) { return a-b; } double mul(double a,double b) { return a*b; } double div(double a,double b) { return a/b; } int main() { double a10; double b20; double(*p)(double,double)NULL; //函数指针 int choice0; printf( 1 \n 2 - \n 3 * \n 4 / \n); scanf(%d,choice); switch(choice) { case 1: padd; break; //如果不写这句话程序会一直进行下去 case 2: psub; break; case 3: pmul; break; case 4: pdiv; break; } double retp(a,b); //add(a,b);sub(a,b);mul(a,b);div(a,b); printf(p(a,b):%lf\n,ret); return 0; }

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