Смотри и изумляйся как это делают фантазеры-энтузиасты
| Код |
#include "stdio.h"
#include "string.h"
#include "conio.h"
int HexstrToInt( char *hexstr, int control )
{
int value=-1, x=0, sixspace=0, n=0;
if( strlen(hexstr) <3 )
{
if (hexstr[0] =='a' || hexstr[0] =='A') x =10;
else if (hexstr[0] =='b' || hexstr[0] =='B') x =11;
else if (hexstr[0] =='c' || hexstr[0] =='C') x =12;
else if (hexstr[0] =='d' || hexstr[0] =='D') x =13;
else if (hexstr[0] =='e' || hexstr[0] =='E') x =14;
else if (hexstr[0] =='f' || hexstr[0] =='F') x =15;
else if (hexstr[0] =='1') x=1;
else if (hexstr[0] =='2') x=2;
else if (hexstr[0] =='3') x=3;
else if (hexstr[0] =='4') x=4;
else if (hexstr[0] =='5') x=5;
else if (hexstr[0] =='6') x=6;
else if (hexstr[0] =='7') x=7;
else if (hexstr[0] =='8') x=8;
else if (hexstr[0] =='9') x=9;
}
else
{
if (control <2)
{
//счетчик количества запусков функцей самой себя на 1
char *tmp =new char[2*sizeof(char)];
tmp[0] =hexstr[0];
tmp[1] =hexstr[1];
tmp[2] ='\0';
x =HexstrToInt( tmp, control ); //рекурсия пошла
control++; //Контроль глубины
delete [] tmp;
}
else return -1; //какая то ошибка
}
if ((n =(strlen(hexstr))) >0) n--;
if (hexstr[n] =='a' || hexstr[n] =='A') sixspace =0;
else if (hexstr[n] =='b' || hexstr[n] =='B') sixspace =1;
else if (hexstr[n] =='c' || hexstr[n] =='C') sixspace =2;
else if (hexstr[n] =='d' || hexstr[n] =='D') sixspace =3;
else if (hexstr[n] =='e' || hexstr[n] =='E') sixspace =4;
else if (hexstr[n] =='f' || hexstr[n] =='F') sixspace =5;
else if (hexstr[n] =='0') sixspace =-10;
else if (hexstr[n] =='1') sixspace =-9;
else if (hexstr[n] =='2') sixspace =-8;
else if (hexstr[n] =='3') sixspace =-7;
else if (hexstr[n] =='4') sixspace =-6;
else if (hexstr[n] =='5') sixspace =-5;
else if (hexstr[n] =='6') sixspace =-4;
else if (hexstr[n] =='7') sixspace =-3;
else if (hexstr[n] =='8') sixspace =-2;
else if (hexstr[n] =='9') sixspace =-1;
value =(sixspace +(6*x)) +((x+1)*10);
return value;
}
void main( int argc, char *argv[] )
{
int i=-1;
char s[2];
/*
ввести надо число типа FF или 1A или 0E именно так без приставок
типа 0xAF
*/
printf( "Enter hex value " );
scanf( "%s", &s); //вводим два символа
if( (i=(HexstrToInt( s, 0 ))) >-1 );
printf( "%s -in HEX = %d - in DEC\n", s, i );
getch();
return;
}
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