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10106.cpp
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10106.cpp
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#include <iostream>
using std::cout;
using std::cin;
using std::endl;
using std::istream;
using std::ostream;
#include <cstdlib>
class bigNumber
{
friend ostream &operator<<(ostream &,const bigNumber &);
friend istream &operator>>(istream &,bigNumber &);
private :
char body[1000];
int count(void);
public :
void operator+(bigNumber &);
void operator*(bigNumber &);
};
ostream &operator<<(ostream &output,const bigNumber &right)
{
output<<right.body;
return output;
}
istream &operator>>(istream &input,bigNumber &right)
{
input>>right.body;
return input;
}
int bigNumber::count(void)
{
int i;
for (i=0;body[i]!='\0';i++) ;
return i-1;
}
void bigNumber::operator+(bigNumber &right)
{
int i,j,t=0;
int k;
int asdf;
int jj;
char *temp;
i=count();
j=right.count();
if (i>j) temp=new char[i+2],k=i;
else temp=new char[j+2],k=j;
temp[k+1]='\0';
while (i>-1 || j>-1)
{
if (i<0) asdf=0,jj=right.body[j]-'0';
else if (j<0) jj=0,asdf=body[i]-'0';
else asdf=body[i]-'0',jj=right.body[j]-'0';
t=t+asdf+jj;
temp[k]=t%10+'0';
t/=10;
i--,j--,k--;
}
if (t!=0)
{
body[0]=t+'0';
strcpy(body+1,temp);
}
else strcpy(body,temp);
}
void bigNumber::operator*(bigNumber &right)
{
bigNumber temp;
temp.body[0]='0';
temp.body[1]='\0';
bigNumber tempt;
char *t;
int i,j,k,p,kk;
int jjj;
int judge;
i=count();
j=right.count();
t=new char[i+2];
kk=j;
while (kk>-1)
{
p=0;
t[i+1]='\0';
for (k=i;k>-1;k--)
{
jjj=(right.body[kk]-'0')*(body[k]-'0')+p;
t[k]=jjj%10+'0';
p=jjj/10;
}
if (p==0)
{
strcpy(tempt.body,t);
judge=i+1;
}
else
{
tempt.body[0]=p+'0';
strcpy(tempt.body+1,t);
judge=i+2;
}
for (k=0;k<j-kk;k++)
tempt.body[judge]='0',tempt.body[judge+1]='\0',judge++;
if (tempt.body[0]!='0')
temp+tempt;
kk--;
}
strcpy(body,temp.body);
}
main()
{
bigNumber a,b;
while (cin>>a>>b)
{
a*b;
cout<<a<<endl;
}
return 0;
}