## C program to convert a hexadecimal number into a binary number

Here, we are going to learn how to convert a hexadecimal number into a binary number in C programming language?
Submitted by Nidhi, on July 03, 2021

Problem Solution:

Here, we will read a hexadecimal number and convert it into a binary number and print the result on the console screen.

Program:

The source code to convert a hexadecimal number into a binary number is given below. The given program is compiled and executed using GCC compile on UBUNTU 18.04 OS successfully.

```// C program to convert a hexadecimal number
// into binary number

#include <stdio.h>

int main()
{
char HexNum[32] = { 0 };
int i = 0;

scanf("%s", HexNum);

printf("Binary Number: ");

while (HexNum[i]) {
switch (HexNum[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':
case 'A':
printf("1010");
break;

case 'b':
case 'B':
printf("1011");
break;

case 'c':
case 'C':
printf("1100");
break;

case 'd':
case 'D':
printf("1101");
break;

case 'e':
case 'E':
printf("1110");
break;

case 'f':
case 'F':
printf("1111");
break;

default:
printf("\nInvalid hexa digit: %c", HexNum[i]);
return 0;
}
i++;
}
return 0;
}
```

Output:

```Enter the Hexadecimal number: A123
Binary Number: 1010000100100011
```

Explanation:

Here, we created a character array HexNum and integer variable i. Then we read the hexadecimal number and convert the number into a binary number and printed the result on the console screen.

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