How to convert binary to hexadecimal using C language?

Binary numbers are represented by 1 and 0.

The 16-digit hexadecimal number system is {0,1,2,3…..9, A(10), B(11),… …F(15)}

To convert from binary to hexadecimal representation, the bit string id is grouped into 4-bit blocks, called nibbles starting from the least significant side. Each block is replaced with the corresponding hexadecimal number.

Let us see an example to get a clear understanding of hexadecimal and binary number representation.

0011 1110 0101 1011 0001 1101
  3    E    5    B   1    D

We write hexadecimal constants as 0X3E5B1D in C language.

Another example on how to convert decimal to binary and then to hexadecimal is as follows -

7529D = 0000 0000 0000 0000 0001 1101 0110 1001B
      = 0x00001D69 = 0x1D69

Example

The following is the C program,How Use a while loop to convert a binary number to an equivalent hexadecimal number -

Live demonstration

#include <stdio.h>
int main(){
   long int binaryval, hexadecimalval = 0, i = 1, remainder;
   printf("Enter the binary number: ");
   scanf("%ld", &binaryval);
   while (binaryval != 0){
      remainder = binaryval % 10;
      hexadecimalval = hexadecimalval + remainder * i;
      i = i * 2;
      binaryval = binaryval / 10;
   }
   printf("Equivalent hexadecimal value: %lX", hexadecimalval);
   return 0;
}

Output

When the above program is executed, it will be generated The following results-

Enter the binary number: 11100
Equivalent hexadecimal value: 1C

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