Write a C program to read decimal number from user and convert to Hexadecimal number system. How to convert Decimal number system to Hexadecimal number system in C programming. Logic to convert decimal to hexadecimal number system in C program.

**Example**

**Input**

Input decimal number: 26

**Output**

Hexadecimal number: 1A

## Required knowledge

## Decimal number system

Decimal number system is a base 10 number system. Decimal number system uses 10 symbols to represent all number i.e. 0123456789

## Hexadecimal number system

Hexadecimal number system is a base 16 number system. Hexadecimal number system uses 16 symbols to represent all numbers i.e. 0123456789ABCDEF

## Algorithm to convert from decimal to hexadecimal

Algorithm Conversion from Decimal to Hexadecimalbegin:read (decimal);hex← NULL;rem← 0;HEXVALUES[] ← 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F;While(decimal!= 0)begin:rem←decimal% 16;hex←hex+HEXVALUES[rem];decimal←decimal/ 16;end;Reverse(hex); print('Hexadecimal = 'hex);end;

## Program to convert decimal to hexadecimal

/** * C program to convert from Decimal number system to hexadecimal number system */ #include <stdio.h> #include <string.h> int main() { char HEXVALUE[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'}; long long decimal, tempDecimal; char hex[65]; int index, rem; /* * Input decimal number from user */ printf("Enter any decimal number: "); scanf("%lld", &decimal); tempDecimal = decimal; index = 0; /* * Decimal to hexadecimal conversion */ while(tempDecimal !=0) { rem = tempDecimal % 16; hex[index] = HEXVALUE[rem]; tempDecimal /= 16; index++; } hex[index] = '\0'; strrev(hex); printf("\nDecimal number = %lld\n", decimal); printf("Hexadecimal number = %s", hex); return 0; }

Enter any decimal number: 427 Decimal number = 427 Hexadecimal number = 1AB

Happy coding ;)

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