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From: "Youhei Kawada" <kawada@po.jah.ne.jp>
To: =?iso-2022-jp?B?GyRCR3BMWhsoQiAbJEIybTFRGyhC?= <kashi@mn.waseda.ac.jp>
Subject: [JSJ]make10
Date: Thu, 13 May 1999 23:28:20 +0900
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Status: OR

#include <iostream.h>
#include <fstream.h>

ofstream fout("c:\\output.txt",ios::out);
int num=0;
char *ope = "+-*/";


double calcu(int opera, double a, double b);
void print(int a, int b, int c, int d);

void main(void){
 int i,j,k,l;
 for (i = 0; i <= 9; i++){for (j = i; j <= 9; j++){
  for (k = j; k <= 9; k++){for (l = k; l <= 9; l++){
   print(i,j,k,l); print(i,j,l,k); print(i,k,j,l); print(i,k,l,j);
print(i,l,j,k); print(i,l,k,j);
   print(j,i,k,l); print(j,i,l,k); print(j,k,i,l); print(j,k,l,i);
print(j,l,i,k); print(j,l,k,i);
   print(k,i,j,l); print(k,i,l,j); print(k,j,i,l); print(k,j,l,i);
print(k,l,i,j); print(k,l,j,i);
   print(l,i,j,k); print(l,i,k,j); print(l,j,i,k); print(l,j,k,i);
print(l,k,i,j); print(l,k,j,i);
 }}}}
}

void print(int a, int b, int c, int d){
 int p,q,r;
 double ans1,ans2,ans3;
 for (p = 0; p <= 3; p++){
  ans1 = calcu(p, a, b);
  for (q = 0; q <= 3; q++){
   ans2 = calcu(q, ans1, c);
   for (r = 0; r <= 3; r++){
    ans3 = calcu(r, ans2, d);
    if (ans3 == 10){
     fout << "((" << a << ope[p] << b << ")" << ope[q] << c << ")" << ope[r]
<< d << " ";
     num++;
     if(num%7==0){fout << endl;}
    }
 }}}
 for (p = 0; p <= 3; p++){
  ans1 = calcu(p, a, b);
  for (q = 0; q <= 3; q++){
   ans2 = calcu(q, c, d);
   for (r = 0; r <= 3; r++){
    ans3 = calcu(r, ans1, ans2);
    if (ans3 == 10){
     fout << "(" << a << ope[p] << b << ")" << ope[r] << "(" << c << ope[q]
<< d << ")" << " ";
     num++;
     if(num%7==0){fout << endl;}
    }
 }}}
}

double calcu(int opera, double a, double b){
 switch (opera){
 case  0: return(a + b); break;
 case  1: return(a - b); break;
 case  2: return(a * b); break;
 default: return(a / b); break;
 }
}

----
早稲田大学理工学部情報学科３年
G97P029-2  川田 洋平
kawada@po.jah.ne.jp
g97p0292@mn.waseda.ac.jp