Question

设函数f(x,y)=x^2-2xy+3y^2,求:(1)f(0,1)(2)f(tx,ty)

Answer 1

#include<stdio.h>

int f(int x,int y);

int main()

{

int x,y,t;

aa: printf("请输入x值：");

scanf("%d",&x);

printf("请输入y值：");

scanf("%d",&y);

printf("请输入t值：");

scanf("%d",&t);

if(t==1)

printf("f(%d,%d)=",x,y);

if(t!=1)

printf("f(tx,ty)=");

printf("%d\n",f(t*x,t*y));

goto aa;

return 0;

}

int f(int x,int y)

{

return x*x-2*x*y+3*y*y;

}