Dec 21, 2011

K & R C Programs Exercise 2-3.

K and R C, Solution to Exercise 2-3:
C Function htoi() which converts a string of hexa decimal digits into its equivalent integer value. K and R C Program. Exercises provides the solution to all the exercises in the C Programming Language, second addition, by Brian W.Keringhan and Dennis M.Ritchie(Prentice Hall,1988). You can learn and solve K&R C Programs Exercise. Read more about C Programming Language .

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#define YES 1
#define NO  0
//HTOI: CONVERT HEXADECIMAL STRING S TO INTEGER
int htoi(char s[])
{
 int hexdigit, i, inhex, n,i=0;
 if(s[i]=='0'){
  ++i;
  if(s[i]=='x' || s[i]=='x')
   ++i;
 }
 n=0;
 inhex=YES;
 for(;inhex==YES;++i){
  if(s[i]>='0' && s[i]<='9')
   hexdigit=s[i]-'0';
  else if(s[i]>='a' && s[i]<='f')
   hexdigit=s[i]-'a'+10;
  else if (s[i]>='A' && s[i]<='F')
   hexdigit=s[i]-'A'+10;
  else
   inhex=NO;
  if(inhex==YES)
   n=16*n+hexdigit;
 }
 return n;
}


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