Question

C语言分段函数y=-1(x>9) ;y=x*(x+2)(3<x<=9);y=2*x(-1<x<=3);y=x-1(x<-1)

以下程序改错
y= -1 x>9
x*(x+2) 3<x<=9
2*x -1<x<=3
x-1 x<=-1
#include <stdio.h>
int main()
1 { int x ,y ;
2 scanf(“%d”,&x);
3 if(3<x<=9) y=x*(x+2);
4 else if (-1<x<=3) y=2*x;
5 else if (x<=-1)y=x-1;
6 else y=-1;
7 printf(“%d\n”,y);
8 return0;
9 }

Answer 1

#include <stdio.h>

int main()
{
	int x,y;
	scanf("%d",&x);
	if(x>9)
		y=-1;
	else if(3<x && x<=9)
		y=x*(x+2);
	else if(-1<x && x<=3)
		y=2*x;
	else if(x<=-1)
		y=x-1;
	printf("%d\n",y);
	while(1);
	return 0;
}

不能连续比较