Thread: Conversion of hex to decimal

Hi
I have been trying to convert hexadecimal to decimal value just i need to get 5 input hex values and store it in an array and convert them to decimal values, as i compiled i am getting error as "Time limit exceeded".And i tried this on turbo c ,am getting error as "character constant must be one or two characters long".

Code:

#include <stdio.h>
#include<math.h>
#include<string.h>

int main(void) {
    int i,j,num,len,counter=0;
    long int sum=0;  //value can cross range of int
     char hex[100]={'1ED7','1ED8','1ED6','1ED5','1ED6'};

        //conversion to dec
    len=strlen(hex);
    printf("%d",len);
        for(i=0;i<5;i++)
    {

    for(i=len-1;i>=0;i--)
    {
       if(hex[i]>='0'&&hex[i]<='9')
          num=hex[i]-'0';     //the character is number in between 0 to 9
       else
       {
          if(hex[i]>='A'&&hex[i]<='F')
          num=hex[i]-55;      //the character is either a,b,c,d,e or f 
          else
          {
              printf("The Entered number is not hexadecimal number");
             // getch();// If the character is beyond 'f'
              return 1;
          }
       }
       sum=sum+pow(16,counter)*num;  //according to formula given by the link
       counter++;
    } 
    }
    printf("Hexadecimal conversion of %s to decimal is %ld",hex,sum);
    return 0;
}
        
        //conversion to weight
//    }
//    return 0;
//}*/

pls help?!