Write a C program to convert binary to decimal number. In this programming question, we are going to write a code which takes binary number as an input and print their decimal representation.

This question is very important in terms of technical interview.

C interview questions and answers

For example -

Input : 100 (Binary Number)

Output : 4 (Decimal Number)

Input : 111 (Binary Number)

Output : 7 (Decimal Number)

C++ program to convert binary to decimal number

Let's assume, we have to convert 100 to decimal number.

Decimal Number Conversion : 1 * 2

Similarly, we can convert any binary representation into decimal number.

Program to Convert Decimal to Binary Number

Program to count number of digits of a number

Decimal number is 8

Programming question on Arrays

This question is very important in terms of technical interview.

C interview questions and answers

For example -

Input : 100 (Binary Number)

Output : 4 (Decimal Number)

Input : 111 (Binary Number)

Output : 7 (Decimal Number)

C++ program to convert binary to decimal number

### How to Convert Binary to Decimal Number

Let's assume, we have to convert 100 to decimal number.

Decimal Number Conversion : 1 * 2

^{2 }+ 0 * 2^{1 }+ 0 * 2^{0}= 4Similarly, we can convert any binary representation into decimal number.

Program to Convert Decimal to Binary Number

Program to count number of digits of a number

## C Program to Convert Binary to Decimal Number

#include <stdio.h> #include <math.h> int main() { int bnum, sum, rem, count=0; printf("Enter a binary number \n"); scanf("%d",&bnum); /* Initialize a sum variable to 0 */ sum = 0; while(bnum > 0){ /* Take a Remainder */ rem = bnum%10; /* If remainder is other than 0 and 1, then it is not a binary number. */ if(rem==0 || rem==1 ){ /* calculate sum. */ sum = sum + rem *pow(2,count); /* Divide to reduce the number length. */ bnum = bnum/10; /* Increment the count. */ ++count; } else { printf(" Please enter valid binary number \n"); return 0; } } printf("\n Decimal number is %d",sum); return 0; }

**Output:****Enter binary number 1000**

Decimal number is 8

Programming question on Arrays

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