How to convert hexadecimal string (with float) to binary in C?

Question

I already have a program that converts hexadecimal numbers into its binary form, the only problem is that it does not accept hexadecimals with float. Here is the code:

    /* HEXADECIMAL TO BINARY */
    #include<stdio.h>
    #define MAX 1000

    int main(){
char hexaDecimal[MAX], *pch;
long int i=0;
clrscr();
printf("Enter any hexadecimal number: ");
scanf("%s",hexaDecimal);
printf("\nEquivalent binary value: ");

while(hexaDecimal[i]){
     switch(hexaDecimal[i]){
         case '0': printf("0000"); break;
         case '1': printf("0001"); break;
         case '2': printf("0010"); break;
         case '3': printf("0011"); break;
         case '4': printf("0100"); break;
         case '5': printf("0101"); break;
         case '6': printf("0110"); break;
         case '7': printf("0111"); break;
         case '8': printf("1000"); break;
         case '9': printf("1001"); break;
         case 'A': printf("1010"); break;
         case 'B': printf("1011"); break;
         case 'C': printf("1100"); break;
         case 'D': printf("1101"); break;
         case 'E': printf("1110"); break;
         case 'F': printf("1111"); break;
         case 'a': printf("1010"); break;
         case 'b': printf("1011"); break;
         case 'c': printf("1100"); break;
         case 'd': printf("1101"); break;
         case 'e': printf("1110"); break;
         case 'f': printf("1111"); break;
     default:  printf("\nInvalid hexadecimal digit %c ",hexaDecimal[i]);
     return 0;
     }
     i++;
}
    getch();
return 0;
}

I tried splitting the string using strtok but it doesn't work.. All I need is for this program to also work with hexadecimal fractions. Thanks for the responses in advance!

What kind of input are you entering? What do you mean by "Hexadecimals with float"? — Corb3nik
– Corb3nik, Commented Oct 6, 2015 at 15:14
Does input include e for exponentiation? How about -, +, .? — chux
– chux, Commented Oct 6, 2015 at 15:22

Alex Lop. · Accepted Answer · 2015-10-06 15:20:33Z

1

Just add to your switch block:

case '.': printf("."); break;

answered Oct 6, 2015 at 15:20

Alex Lop.

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Comments

HeavenHM · Accepted Answer · 2017-11-24 13:53:58Z

0

Just use strtoul defined in stdlib.h you can convert any radix base to decimal from this method including Hexa-decimal.

answered Nov 24, 2017 at 13:53

HeavenHM

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1 Comment

Dwhitz Over a year ago

Please read How do I write a good answer

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