编辑代码

#include <stdlib.h>
#include <stdio.h>
int main () {
    int x;
    int f;
    int k;
    scanf("%d",&x);
    k=x / abs(x) ;
    switch(k){
    case 1 :
    f=2*x;
    printf("%d",f);
    break;
    case -1 :
    printf("%d",-1);
    break;
    default:
    printf("%d",0);
    break;
    
 }
   
    return 0;
}