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#include<stdio.h>
char mark[4]={'+','-','*','/'};
float cal(float x,float y,int mark)
{
??switch(mark)
??{
????case 0:return x+y;
????case 1:return x-y;
????case 2:return x*y;
????case 3:return x/y;
??}
}
float calculate_A(float a,float b,float c,float d,int mark1,int mark2,int mark3)
{
??float r1,r2,r3;
??r1=cal(a,b,mark1);
??r2=cal(r1,c,mark2);
??r3=cal(r2,d,mark3);
??return r3;
}
float calculate_B(float a,float b,float c,float d,int mark1,int mark2,int mark3)
{
??float r1,r2,r3;
??r1=cal(b,c,mark2);
??r2=cal(a,r1,mark1);
??r3=cal(r2,d,mark3);
??return r3;
}
float calculate_C(float a,float b,float c,float d,int mark1,int mark2,int mark3)
{
??float r1,r2,r3;
??r1=cal(c,d,mark3);
??r2=cal(b,r1,mark2);
??r3=cal(a,r2,mark1);
??return r3;
}
float calculate_D(float a,float b,float c,float d,int mark1,int mark2,int mark3)
{
??float r1,r2,r3;
??r1=cal(b,c,mark2);
??r2=cal(r1,d,mark3);
??r3=cal(a,r2,mark1);
??return r3;
}
float calculate_E(float a,float b,float c,float d,int mark1,int mark2,int mark3)
{
??float r1,r2,r3;
??r1=cal(a,b,mark1);
??r2=cal(c,d,mark3);
??r3=cal(r1,r2,mark2);
??return r3;
}
float get(int a,int b,int c,int d)
{
??int mark1,mark2,mark3;
??float flag=0;
??for(mark1=0;mark1<4;mark1++)
??{
????for(mark2=0;mark2<4;mark2++)
????{
??????for(mark3=0;mark3<4;mark3++)
??????{
????????if(calculate_A(a,b,c,d,mark1,mark2,mark3)==24)
????????{
??????????printf("((%d%c%d)%c%d)%c%d=24\n",a,mark[mark1],b,mark[mark2],c,mark[mark3],d);
??????????flag=1;
????????}
????????if(calculate_B(a,b,c,d,mark1,mark2,mark3)==24)
????????{
??????????printf("(%d%c(%d%c%d))%c%d=24\n",a,mark[mark1],b,mark[mark2],c,mark[mark3],d);
??????????flag=1;
????????}
????????if(calculate_C(a,b,c,d,mark1,mark2,mark3)==24)
????????{
??????????printf("%d%c(%d%c(%d%c%d))=24\n",a,mark[mark1],b,mark[mark2],c,mark[mark3],d);
??????????flag=1;
????????}
????????if(calculate_D(a,b,c,d,mark1,mark2,mark3)==24)
????????{
??????????printf("%d%c((%d%c%d)%c%d)=24\n",a,mark[mark1],b,mark[mark2],c,mark[mark3],d);
??????????flag=1;
????????}
????????if(calculate_E(a,b,c,d,mark1,mark2,mark3)==24)
????????{
??????????printf("(%d%c%d)%c(%d%c%d)=24\n",a,mark[mark1],b,mark[mark2],c,mark[mark3],d);
??????????flag=1;
????????}
??????}
????}
??}
??return flag;
}
main()
{
??int a,b,c,d;
??printf("Please input 4 numbers(1~13):");
??scanf("%d%d%d%d",&a,&b,&c,&d);
????if((a>=1&&a<=13)&&(b>=1&&b<=13)&&(c>=1&&c<=13)&&(d>=1&&d<=13))
????{
??????get(a,b,c,d);
????}
??????else
??????{
????????printf("Input illegal,please input again(1~13):");
????????scanf("%d%d%d%d",&a,&b,&c,&d);
????????if((a>=1&&a<=13)&&(b>=1&&b<=13)&&(c>=1&&c<=13)&&(d>=1&&d<=13))
???????? {
??????????????get(a,b,c,d);
???????? }
??????}
??system("pause");
}

#include<stdio.h>
int chu(int p,int q)
{
????if(p%q==0)return p/q;
????else
????????return 111111;
}
int fun(int i,int j,int c)
{
????int s;
????switch(c)
????{
????case 1:s=i+j;break;
????case 2:s=i-j;break;
????case 3:s=i*j;break;
????case 4:s=chu(i,j);break;
????}
????return s;
}
void print(int c)
{
????if(c==1)printf("+");
????else if(c==2)printf("-");
????else if(c==3)printf("*");
????else printf("/");
}
int main()
{
????int f[4];
????int i,j,m,n;
????int a,b,c;
????int d1,d2,d3;
????scanf("%d%d%d%d",&f[0],&f[1],&f[2],&f[3]);
????for(i=0;i<4;i++)
????????for(j=0;j<4;j++)
????????????if(j!=i)
????????????????for(m=0;m<4;m++)
????????????????????if(m!=i&&m!=j)
????????????????????????for(n=0;n<4;n++)
????????????????????????????if(n!=i&&n!=j&&n!=m)
????for(a=1;a<5;a++)
????????for(b=1;b<5;b++)
????????????for(c=1;c<5;c++)
????????????{
????????????????d1=fun(f[i],f[j],a);
????????????????d2=fun(d1,f[m],b);
????????????????d3=fun(d2,f[n],c);
????????????????if(d3==24)
????????????????{
????????????????????printf("%d",f[i]);
????????????????????print(a);
????????????????????printf("%d",f[j]);
????????????????????print(b);
????????????????????printf("%d",f[m]);
????????????????????print(c);
????????????????????printf("%d=24\n",f[n]);
????????????????}
????????????}
????????????return 0;
}