C code to convert decimal to hexadecimal

Hexadecimal number system: It is base 16 number system which uses the digits from 0 to 9 and A, B, C, D, E, F.

Decimal number system:
It is base 10 number system which uses the digits from 0 to 9

Decimal to hexadecimal conversion method:

Following steps describe how to convert decimal to hexadecimal

Step 1: Divide the original decimal number by 16
Step 2: Divide the quotient by 16
Step 3: Repeat the step 2 until we get quotient equal to zero.

Equivalent binary number would be remainders of each step in the reverse order.

Decimal to hexadecimal conversion example:

For example we want to convert decimal number 900 in the hexadecimal.

Step 1: 900 / 16 Remainder : 4 , Quotient : 56
Step 2: 56 / 16 Remainder : 8 , Quotient : 3
Step 3: 3 / 16 Remainder : 3 , Quotient : 0

So equivalent hexadecimal number is: 384
That is (900)10 = (384)16

C Program

#include<stdio.h>
int main() {
	long int decimalNumber,remainder,quotient;
	int i=1,j,temp;
	char hexadecimalNumber[100];
	printf("Enter any decimal number: ");
	scanf("%ld",&decimalNumber);
	quotient = decimalNumber;
	while(quotient!=0) {
		temp = quotient % 16;
		//To convert integer into character
		if( temp < 10)
		           temp =temp + 48; else
		         temp = temp + 55;
		hexadecimalNumber[i++]= temp;
		quotient = quotient / 16;
	}
	printf("Equivalent hexadecimal value of decimal number %d: ",decimalNumber);
	for (j = i -1 ;j> 0;j--)
	      printf("%c",hexadecimalNumber[j]);
	return 0;
}

Output

Enter any decimal number: 45
Equivalent hexadecimal value of decimal number 45: 2D

C Program

#include<stdio.h>
int main() {
	long int decimalNumber;
	printf("Enter any decimal number: ");
	scanf("%d",&decimalNumber);
	printf("Equivalent hexadecimal number is: %X",decimalNumber);
	return 0;
}

Output

Enter any decimal number: 45
Equivalent hexadecimal number is: 2D