- Write a C program to convert binary number to hexadecimal number system.
- Wap in C to convert a base 2 number to a base 16 number.

#### Required Knowledge

**Binary number system** is a base 2 number system using digits 0 and 1 whereas **Hexadecimal number system** is base 16 and using digits from 0 to 9 and A to F. Given a binary number as input from user convert it to hexadecimal number.

##### For Example

10001111 in Binary is equivalent to 8F in hexadecimal number.## C program to convert a decimal number to hexadecimal number

#include <stdio.h> #include <string.h> int main() { int hexDigitToBinary[16] = {0, 1, 10, 11, 100, 101, 110, 111, 1000, 1001, 1010, 1011, 1100, 1101, 1110, 1111}; char hexDigits[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'}; char hexaDecimalNumber[20]; long binaryNumber; int position, i, digits; /* * Take a binary number as input from user */ printf("Enter a Binary Number\n"); scanf("%ld", &binaryNumber); position = 0; /* Convert a Hexadecimal Number to Binary Number */ while(binaryNumber!=0) { /*get the last 4 binay digits */ digits = binaryNumber % 10000; for(i=0; i<16; i++) { if(hexDigitToBinary[i] == digits) { hexaDecimalNumber[position] = hexDigits[i]; position++; break; } } binaryNumber /= 10000; } hexaDecimalNumber[position] = '\0'; strrev(hexaDecimalNumber); printf("Hexadecimal Number : %s", hexaDecimalNumber); return 0; }

**Program Output**

Enter a Binary Number 10010101 Hexadecimal Number : 95

Enter a Binary Number 10001111 Hexadecimal Number : 8F

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