答疑课2019年4月9日创建指针与函数的应用

intsum(intx,inty)//{return}int{inta=1,b=2,c;return0;}voidfun(intx,int{x+=y+=}int{inta=1,b=2;for(;1;){}return}voidfun(int*x,int{x+=y+=}int{inta=1,b=2;for(;1;){}return}voidfun(int*x,int{*x+=*y+=}int{inta=1,b=2;for(;1;){}return}voidfun(int*x,int{*x+=*y+=}int{inta=1,b=2;for(;1;){}return}voidfun(int*x,int{*x+=*y+=}int{inta=1,b=2;for(;1;){}return}voidfun(int*x,int{Int*z=x;x+=y+=}int{inta=1,b=2;for(;1;);return}voidfun(int*x,int{Intx+=y+=}int{inta=1,b=2;for(;1;);return}voidfun(int*x,int{Intx+=y+=}int{inta=1,b=2;for(;1;);return}voidfun(int*x,int{Int*x+=*y+=}int{inta=1,b=2;for(;1;);return}*函数名（参数列表）；普通函数intfun(intx,int指针函数Int*fun(intx,intint类型的指针，返回的是一个地址。int{inta,b,Sum,*q=NULL;scanf("%d%d",&a,&b);q=∑Sum=a+b;returnq;//return}int{int*sum=NULL;for(;1;){}return}如：int(*fun)(参数列表)intadd(intx,inty){returnx+y;}intsub(intx,inty){returnx-y;}int(*fun)(intxinty);//函数指针intmain(){fun=add;fun=⊂printf("(*fun)(1,2)=%d\n",(*fun)(1,2));for(;;);return}由于两者容易，一定要理解这两者的定义和区别指针函数：int*fun(intx,int函数指针：int*fun)(intx,intmin，并进行相关操作。#define_CRT_SECURE_NO_WARNINGSint{intmax(intx,inty);intmin(intx,inty);inta,b,c,n;if(n==1)p=max;elseif(n==2)p=min;c=(*p)(a,b);if(n==elseif(n==2)printf("min=%d\n",c);for(;1;);return}intmax(intx,int{intz=x>y?x:y;returnz;}intmin(intx,int{intz=x<y?x:y;returnz;}

voidfun(int*x1)(int),int*x2)(int,intfun{inta=(*x1)(ix1f1，ib=(*x2)(i,j);//x2f2，i、j}1、231ab中最大的数，当2ab3ab之和。#define_CRT_SECURE_NO_WARNINGSint{intfun(intx,inty,int(*p)(int,int));intmax(intx,inty);intmin(intx,inty);intadd(intx,inty);int(*p)(int,int)=NULL;inta,b,c,n;scanf("%d",&n);scanf("%d%d",&a,&b);if(n==1)p=max;elseif(n==2)p=min;elseif(n==3)p=add;c=fun(a,b,p);printf("a=%d\tb=%d\n",a,if(n==1)printf("max=%d\n",c);elseif(n==2)printf("min=%d\n",c);elseif(n==3)printf("add=%d\n",c);for(;1;);return}intfun(intx,inty,int(*p)(int,{intz=(*p)(x,y);returnz;}intmax(intx,int{in