Thread: trying to convert hexadecimal to decimal

I am using wmware player with centos and it keeps saying that there is something wrong with my pow method and i can't figure it out. When i run the program it doesn't give me any output. Oh and i'm going to try to add a code tag, i really hope i do this right, if not i'm sorry.

Code:

#include<stdio.h>
#include<math.h>
main()
{
   char s[1000],c;
   int i,A,B,C,D,E,F,j;
   double k,g;
   i,j=0;
   g,k=0.0;
   A=10;
   B=11;
   C=12;
   D=13;
   E=14;
   F=15;
   while((c=getchar()) !='\n')
   {
     s[i++]=c;
   }
   s[i]='\0';
   for(j=i;j>=0;j--)
   {
     g=g+(((int)s[j])*(pow(16,k)));
     k++;
   }
   putchar(g);
   return 0;
}

What is g and i equal to when you start using them in your code?

Originally Posted by Subsonics

What is g and i equal to when you start using them in your code?

g is initialized at 0 and so is i but i is then goes through the while loop and becomes how many positions in the array and g goes through the for loop and becomes the answer.

Originally Posted by stahta01

There is no line in your posted code that initialized those two variables.
Note: "," is not an assignment operator.

Tim S.

oh yea the way to do that is i=j=0 and g=k=0.0 I forgot, thanks...i changed it but i still get this error:

Code:

/tmp/ccUFewuZ.o: In function `main':
hw3.c:(.text+0xb7): undefined reference to `pow'
collect2: ld returned 1 exit status

Now it actually compiles but it doesn't give me any output when i put in a hexadecimal number, why doesn't it work...i did the gcc -lm hw3.c -o hw3 and ./hw3 -lm, is there anything else wrong with the code?

Originally Posted by chrissy2860

Now it actually compiles but it doesn't give me any output when i put in a hexadecimal number, why doesn't it work...i did the gcc -lm hw3.c -o hw3 and ./hw3 -lm, is there anything else wrong with the code?

You print g with putchar, it's for characters so it will print a corresponding ascii value for g. g might be way larger than 127 since you raise 16 to the power of k in each iteration of your loop.