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## 为什么总是WA？求助各位大牛

Posted by purplefly at 2006-06-18 13:26:09 on Problem 2710
```#include<stdio.h>
#include<math.h>
#define N 300

int DtoS(int n)
{ int i,m,b[N];
i=0;
while(n)
{  b[i]=n%7;
n=n/7;
i++;
}

m=0;

while(i--)
m+=b[i]*pow(10,i);

return m;

}

int StoD(int n)
{ int i,b,c,cout=0;
i=1;
c=10;

while(n/c)
{i++;
c*=10;
}

c=1;
b=1;
while(i--)
{ cout+=(n/b%10)*c;
c*=7;
b*=10;
}
return cout;

}

int max(int a,int b)
{ if(a>=b) return a;
else return b;
}

int min(int a,int b)
{ if(a>=b) return b;
else return a;
}

void main()
{ int n,d,b,e,i,a[N],num,set;
scanf("%d",&num);
set=1;
while(num--)
{
scanf("%d%d%d%d",&n,&d,&b,&e);
printf("Problem set %d: %d / %d, base 7 digits %d through %d: ",set,n,d,b,e);
n%=d;
n=DtoS(n);
d=DtoS(d);

i=0;
while(i<=max(b,e))
{ a[i]=StoD(10*n)/StoD(d);
n=StoD(10*n)%StoD(d);
n=DtoS(n);
i++;
}

i=min(b,e);

while(i<=max(b,e))
{printf("%d",a[i]);
i++;
}

set++;
printf("\n");
}

}```

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