C++编写的16进制转换成10进制的代码

//16Radix number to Decimal  //Programming by : Erfan Nasoori  //Mail : ketn68@yahoo.com  //Date of send : 2009/1/9     #include<iostream.h>  #include<string.h>  #include<math.h>  #include<conio>  void main()  {      int k=-1,j,i;      double sum=0 ;      int x[20];      char hexa[16]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};      char s[20];      cout<<"Number in 16 radix : ";      cin>>s;      for(i=0 ; s[i] ; ++i)      if(s[i] >= 'a'  &&  s[i] <= 'z')           s[i] -= 32;         for(i=0 ; s[i] ; ++i)          for(j=0 ; j<16 ; ++j)          if(s[i] == hexa[j])          {           x[++k]=j;          }         int y=strlen(s);      for( i=(y-1) ,j=0 ; i>=0 ; --i , ++j)      {          sum += (pow(16,i)*x[j]);          }          cout<<"--------------------------------------------------"<<endl;         cout<<"Radix 10 = "<<sum;     getch();  }