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program to convert Hexadecimal to Binary number system
/* program to convert Hexadecimal to Binary number system
Write a C program to input hexadecimal number from user and convert to binary number system. How to convert hexadecimal number system to binary number system in C program.
Hexadecimal number system
Hexadecimal number system is a base 16 number system. It uses 16 symbols to represent all numbers i.e. 0123456789ABCDEF
Binary number system
Binary number system is a base 2 number system. It uses 2 symbols to represent all numbers i.e. 0 and 1.
Hexadecimal to binary conversion is divided in three steps.
Extract each hex digits separately.
Find the binary of each extracted hex digit.
Store the binary equivalent of extracted hexadecimal number to final bin variable.
Repeat the above three steps till all hexadecimal digits are processed.
Hexadecimal to binary conversion table
Decimal Binary Hexadecimal
0 0000 0
1 0001 1
2 0010 2
3 0011 3
4 0100 4
5 0101 5
6 0110 6
7 0111 7
8 1000 8
9 1001 9
10 1010 A
11 1011 B
12 1100 C
13 1101 D
14 1110 E
15 1111 F */
#include <stdio.h>
#include <string.h>
int main()
{
char hex[17], bin[65] = "";
int j = 0;
/* Input hexadecimal number from user */
printf("Enter any hexadecimal number: ");
gets(hex);
/* Extract first digit and find binary of each hex digit */
for(j=0; hex[j]!='\0'; j++)
{
switch(hex[j])
{
case '0':
strcat(bin, "0000");
break;
case '1':
strcat(bin, "0001");
break;
case '2':
strcat(bin, "0010");
break;
case '3':
strcat(bin, "0011");
break;
case '4':
strcat(bin, "0100");
break;
case '5':
strcat(bin, "0101");
break;
case '6':
strcat(bin, "0110");
break;
case '7':
strcat(bin, "0111");
break;
case '8':
strcat(bin, "1000");
break;
case '9':
strcat(bin, "1001");
break;
case 'a':
case 'A':
strcat(bin, "1010");
break;
case 'b':
case 'B':
strcat(bin, "1011");
break;
case 'c':
case 'C':
strcat(bin, "1100");
break;
case 'd':
case 'D':
strcat(bin, "1101");
break;
case 'e':
case 'E':
strcat(bin, "1110");
break;
case 'f':
case 'F':
strcat(bin, "1111");
break;
default:
printf("Invalid hexadecimal input.");
}
}
printf("Hexademial number = %s\n", hex);
printf("Binary number = %s", bin);
return 0;
}
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