#include "stdio.h"
#include "process.h"
int fun0(int x,int y){return (x+y);}
int fun1(int x,int y){return (x-y);}
int fun2(int x,int y){return (x*y);}
int fun3(int x,int y){return (x/y);}
int (*assign[4])(int x,int y);
void assign_function(void)
{
assign[0]=fun0;
assign[1]=fun1;
assign[2]=fun2;
assign[3]=fun3;
}
//const int data[4]={9,8,7,1};
int data[4]={9,8,7,1};
const int fetch[24][4]={
{3,2,1,0},{0,3,2,1},{1,0,3,2},{2,1,0,3},
{3,1,2,0},{0,3,1,2},{2,0,3,1},{1,2,0,3},
{3,0,1,2},{2,3,0,1},{1,2,3,0},{0,1,2,3},
{3,2,0,1},{1,3,2,0},{0,1,3,2},{2,0,1,3},
{3,0,1,2},{1,3,0,2},{2,1,3,0},{0,2,1,3},
{3,1,0,2},{2,3,1,0},{0,2,3,1},{1,0,2,3}};
int calculator[4];
void result(int x,int y,int r,int n)
{
int a[4],b[4];
char  fomular[20],o[4]={'+','-','*','/'};
for(int i=0;i<4;i++)
{
a[i]=fetch[x][i];
b[i]=data[fetch[y][i]];//printf("a[%d]:%d  b[%d]:%d  o[%d]:%c  o[a[%d]]:%c\n",i,a[i],i,b[i],i,o[i],i,o[a[i]]);
}
if((a[0]==0||a[0]==1)&&(a[1]==2||a[1]==3))
  sprintf(fomular,"Method %d:  (%d%c%d)%c%d%c%d=%d\n",n,b[0],o[a[0]],b[1],o[a[1]],b[2],o[a[2]],b[3],r);
else if((a[0]==2||a[0]==3)&&(a[3]!=2||a[3]!=3))
  sprintf(fomular,"Method %d:  %d%c%d%c%d%c%d=%d\n",n,b[0],o[a[0]],b[1],o[a[1]],b[2],o[a[2]],b[3],r);
else sprintf(fomular,"Method %d:  (%d%c%d%c%d)%c%d=%d\n",n,b[0],o[a[0]],b[1],o[a[1]],b[2],o[a[2]],b[3],r);
//printf("\tResult:\n");
printf("\t%s",fomular);

}

void main(void)
{  int r=24;
  //int temp;
  int n=0;
assign_function();
printf("\t\tAchieve 24 point\n\n\tBy Lucifer Star\n\tSingle Studio\n\t\tEMAIL:LetMeGetOne@hotmail.com\n\n");
printf("*****************************************\n");
printf("\tPlease input 1st number:");
scanf("%d",&data[0]);
printf("\tPlease input 2nd number:");
scanf("%d",&data[1]);
printf("\tPlease input 3rd number:");
scanf("%d",&data[2]);
printf("\tPlease input 4th number:");
scanf("%d",&data[3]);
printf("\tWhat do you want to achieve(default:24):");
scanf("%d",&r);
//scanf("%d",&temp);
//temp=getch();
//if(temp!=0x0d) r=temp;

printf("\n     ***********************************\n");
if(data[0]==0||data[1]==0||data[2]==0||data[3]==0) {printf("The 4 numbers shouldn't be 0！");exit(0);}
for(int ii=0;ii<24;ii++)
{
  for(int i=0;i<24;i++)
  {
    int z=0;
    for(int j=0;j<4;j++)
    {
 calculator[j]=data[fetch[i][j]];
    }
    for(int k=0;k<3;k++)
    {
 if(k==0)
 {
    if(calculator[0]%calculator[1]!=0&&fetch[ii][0]==3)
       {z=0;break;}
    else z=assign[fetch[ii][k]](calculator[k],calculator[k+1]);
 }
 else
 {  if(fetch[ii][k]==3)
      if(calculator[k+1]==0||z==0||(z%calculator[k+1])!=0)
     {z=0;break;}
    z=assign[fetch[ii][k]](z,calculator[k+1]);
 }
    }
    if(z==r)
    {    n++;result(ii,i,r,n);   }
   }
}
printf("\n******************************************\n");
if(n==0) printf("Sorry,it's unable to do so!");
else printf("Thanks for using my software!");
}