16进制转10进制

int toInt(char a)
{
int b;
switch(a)
{
case '0':b=0;break;
case '1':b=1;break;
case '2':b=2;break;
case '3':b=3;break;
case '4':b=4;break;
case '5':b=5;break;
case '6':b=6;break;
case '7':b=7;break;
case '8':b=8;break;
case '9':b=9;break;
case 'A':b=10;break;
case 'B':b=11;break;
case 'C':b=12;break;
case 'D':b=13;break;
case 'E':b=14;break;
case 'F':b=15;break;
}
return(b);

}

void main()
{
      char *data = m_hex.GetBuffer(0);     //m_hex表示editbox获取到的16进制数
for (int i =0;i < 4;i++)
{
int n =toInt(data[i]);
for (int j = 3 - i ;j > 0;j--)
{
n *=16;
}
sum += n;
}
m_result.Format("%d",sum);           //m_result表示editbox要显示的10进制数
}