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石田 寛    G97P010-5  g97p010-5@mn.waseda.ac.jp
遅くなりましてすみません。

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <math.h>
 
struct ten
{
 float number;
 char string[20];
};

void maketen(struct ten *num,int n);

int main(int argc,char **argv)
{
 struct ten n[4];

 if(argc!=2)
 {
  printf("No!\n");
  return 0;
 }
 if(isdigit(argv[1][0])==0||isdigit(argv[1][1])==0||
  isdigit(argv[1][2])==0||isdigit(argv[1][3])==0)
 {
  printf("No!\n");
  return 0;
 }

 n[0].number=(float)(argv[1][0]-'0');
 n[1].number=(float)(argv[1][1]-'0');
 n[2].number=(float)(argv[1][2]-'0');
 n[3].number=(float)(argv[1][3]-'0');

 sprintf(n[0].string,"%c%c",argv[1][0],0);
 sprintf(n[1].string,"%c%c",argv[1][1],0);
 sprintf(n[2].string,"%c%c",argv[1][2],0);
 sprintf(n[3].string,"%c%c",argv[1][3],0);

 maketen(n,4);

 return 1;
}

void maketen(struct ten *num,int n)
{
 int i,j,k,l;
 struct ten *tmp;

 if(n==1)
 {
  if(fabs(num[0].number-10)<1e-5)
  {
   printf("%s=10\n",num[0].string);
   return;
  }
 }

 tmp=(struct ten *)malloc(sizeof(struct ten)*(n-1));

 for(i=0;i<n-1;i++)
 {
  for(j=i+1;j<n;j++)
  {
   for(l=0,k=0;k<n;k++)
   {
    if(k!=i&&k!=j)
    {
     tmp[l].number=num[k].number;
     sprintf(tmp[l++].string,"%s",num[k].string);
    }
   }
   tmp[l].number=num[i].number+num[j].number;
   sprintf(tmp[l].string,"(%s+%s)",num[i].string,num[j].string);
   maketen(tmp,n-1);
   tmp[l].number=num[i].number-num[j].number;
   sprintf(tmp[l].string,"(%s-%s)",num[i].string,num[j].string);
   maketen(tmp,n-1);
   tmp[l].number=num[j].number-num[i].number;
   sprintf(tmp[l].string,"(%s-%s)",num[j].string,num[i].string);
   maketen(tmp,n-1);
   tmp[l].number=num[i].number*num[j].number;
   sprintf(tmp[l].string,"(%s*%s)",num[i].string,num[j].string);
   maketen(tmp,n-1);
   if(num[j].number>1e-5)
   {
    tmp[l].number=num[i].number/num[j].number;
    sprintf(tmp[l].string,"(%s/%s)",num[i].string,num[j].string);
    maketen(tmp,n-1);
   }
   if(num[i].number>1e-5)
   {
   tmp[l].number=num[j].number/num[i].number;
   sprintf(tmp[l].string,"(%s/%s)",num[j].string,num[i].string);
   maketen(tmp,n-1);
   }
  }
 }
 free(tmp);
}