# C Program to Convert Decimal Number to Hexadecimal Number

Decimal number system is a base 10 number system using digits 0 and 9 whereas Hexadecimal number system is base 16 number system and using digits from 0 to 9 and A to F. Given an decimal number as input from user convert it to hexadecimal number.
For Example:
1234 in Decimal is equivalent to 4D2 in Hexadecimal number system.

## C program to convert a decimal number to hexadecimal number

```#include <stdio.h>
#include <string.h>

#define BASE_16 16

int main() {
char hexDigits[] = "0123456789ABCDEF";

long decimalNumber;
char hexadecimalNumber[40];
int index, remaindar;

/*
* Take a Decimal Number as input form user
*/
printf("Enter a Decimal Number\n");
scanf("%ld", &decimalNumber);

index = 0;

/* Convert Decimal Number to Hexadecimal Numbers */
while(decimalNumber != 0) {
remaindar = decimalNumber % BASE_16;
hexadecimalNumber[index] = hexDigits[remaindar];
decimalNumber /= BASE_16;
index++;
}
hexadecimalNumber[index] = '\0';

strrev(hexadecimalNumber);

printf("Hexadecimal Number : %s",
hexadecimalNumber);

return 0;
}
```
Output
```Enter a Decimal Number
1234
Hexadecimal Number : 4D2
```
```Enter a Decimal Number
1000
Hexadecimal Number : 3E8
```

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