#include<stdio.h>
#include<math.h>
double conv(char *string)
{
double ch[10];
int i = 0,j =0, count = 0;
double num = 0;
while(*(string+j) != ‘\0’)
{
switch(*(string+j))
{
case ‘A’:
ch[j] = 10;
break;
case ‘B’:
ch[j] = 11;
break;
case ‘C’:
ch[j] = 12;
break;
case ‘D’:
ch[j] = 13;
break;
case ‘E’:
ch[j] = 14;
break;
case ‘F’:
ch[j] = 15;
break;
default:
ch[j] =(*(string+j) – 48);
printf(“%d\n”,*(string+j));
}
j++;
}
for(i = j-1; i >=0 ; i–)
{
num += pow(16,i) * ch[j-i-1];
}
return num;
}
void main()
{
char st[10];
printf(“Please input a string:\n”);
scanf(“%s”,st);
printf(“%lf\n”,conv(st));
}