## Convert decimal to binary in C

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I am trying to convert a decimal to binary such as 192 to 11000000. I just need some simple code to do this but the code I have so far doesn't work:

void dectobin(int value, char* output) { int i; output[5] = '\0'; for (i = 4; i >= 0; --i, value >>= 1) { output[i] = (value & 1) + '0'; } }

Any help would be much appreciated!

The value is not decimal. All values in computer's memory are binary.

What you are trying to do is to convert int to a string using specific base.
There's a function for that, it's called `itoa`

.
http://www.cplusplus.com/reference/cstdlib/itoa/

**Program for Decimal to Binary Conversion,** In this program, we have created a user defined function decimalToBinary() for decimal to binary conversion. The programs takes decimal number (entered by user) Decimal to binary in C: We can convert any decimal number (base-10 (0 to 9)) into binary number(base-2 (0 or 1)) by c program.

First of all `192`

cannot be represented in `4`

bits

`192 = 1100 0000`

which required minimum `8`

bits.

Here is a simple C program to convert Decimal number system to Binary number system

#include <stdio.h> #include <string.h> int main() { long decimal, tempDecimal; char binary[65]; int index = 0; /* * Reads decimal number from user */ printf("Enter any decimal value : "); scanf("%ld", &decimal); /* Copies decimal value to temp variable */ tempDecimal = decimal; while(tempDecimal!=0) { /* Finds decimal%2 and adds to the binary value */ binary[index] = (tempDecimal % 2) + '0'; tempDecimal /= 2; index++; } binary[index] = '\0'; /* Reverse the binary value found */ strrev(binary); printf("\nDecimal value = %ld\n", decimal); printf("Binary value of decimal = %s", binary); return 0; }

**C Program to Convert Decimal Number to Binary Number,** C program to convert decimal to binary. #include <stdio.h>. int main() { int n, c, k;. printf("Enter an integer in decimal number system\n"); scanf("%d", &n);. To convert decimal number to binary number in C programming, you have to ask from user to enter number (in decimal) to convert it into binary number and then display the equivalent value in binary as output. C Programming Code to Convert Decimal to Binary Now let's create a program that converts decimal number to binary number.

5 digits are not enough for your example (192). Probably you should increase `output`

**Decimal to binary in C,** In this C programming example, you will learn to convert binary numbers to decimal and vice-versa manually by creating a user-defined function. We know that computer only understands binary numbers that are 0 and 1. Every data are given as input to computer converts into binary number system. In the same way, conversion of Binary to Decimal, Decimal to Octal and Octal to Decimal, Octal to Binary and Binary to Octal also can be done. C program to Convert Decimal to Binary

A few days ago, I was searching for fast and **portable** way of doing `sprintf("%d", num)`

. Found this implementation at the page itoa with GCC:

/** * C++ version 0.4 char* style "itoa": * Written by Lukás Chmela * Released under GPLv3. */ char* itoa(int value, char* result, int base) { // check that the base if valid if (base < 2 || base > 36) { *result = '\0'; return result; } char* ptr = result, *ptr1 = result, tmp_char; int tmp_value; do { tmp_value = value; value /= base; *ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz" [35 + (tmp_value - value * base)]; } while ( value ); // Apply negative sign if (tmp_value < 0) *ptr++ = '-'; *ptr-- = '\0'; while(ptr1 < ptr) { tmp_char = *ptr; *ptr--= *ptr1; *ptr1++ = tmp_char; } return result; }

**C Program to Convert Binary Number to Decimal and vice-versa,** The value is not decimal. All values in computer's memory are binary. What you are trying to do is to convert int to a string using specific base. There's a function Algorithm to convert Decimal to Binary number. Divide the input decimal number by 2 and store the remainder. Store the quotient back to the input number variable. Repeat this process till quotient becomes zero. Equivalent binary number will be the remainders in above process in reverse order.

**Convert decimal to binary in C,** C programming, exercises, solution: Write a program in C to convert decimal number to binary number using the function. Write a C program to convert decimal to binary number system using loop. Logic to convert decimal to binary number system in C programming. Learn C programming, Data Structures tutorials, exercises, examples, programs, hacks, tips and tricks online.

**C exercises: Convert decimal to binary,** C programming, exercises, solution : Write a program in C to convert a decimal number into binary without using an array. Output : 10001 Note that this method is similar to the one where we convert Binary to Decimal as discussed in this post.. This article is contributed by Harsh Agarwal.If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org.

**C exercises: Convert a decimal number to binary without using an ,** How to write a C Program to Convert Decimal to Binary Number with a practical example?. To convert Decimal Number to Binary Number in C – First, Divide Conversion steps: Divide the number by 2. Get the integer quotient for the next iteration. Get the remainder for the binary digit.

**C Program to Convert Decimal to Binary,** number and to continually divide-by-2 (two) to give a result and a remainder of either a “1” or a “0” until the final result equals zero. Binary form of 15 is 1111 Binary form of 10 is 1010 Binary form of 18 is 10010 Binary form of 27 is 11011. In the above program, the DecimalToBinary function has binary value of the decimal number n and is stored in the array binaryNumber[].

##### Comments

- youtu.be/1MJ1o56x-g8 - this explains the whole solution of your problem.
- There is no decimal here.
`value`

is already binary. - And function sprintf and sscanf
- @holmium They don't usually support base-2. On the other hand,
`itoa`

is also non-standard (but far more common than`printf("%b"`

- Decimal is another way to say a Base10 number. I believe the author is trying to say how do I convert a Base10 number to a Base2 number (regardless of internal representation).
`strrev`

is not part of C standard.- wow, nice trick with palindromic array indexed from the middle.
- What's with all the down vote? I did answer the question but not in C. The algorithm is simple enough to implement in C on his own.
- Thank you for this code snippet, which might provide some limited short-term help. A proper explanation would greatly improve its long-term value by showing
*why*this is a good solution to the problem, and would make it more useful to future readers with other, similar questions. Please edit your answer to add some explanation, including the assumptions you've made. For instance, how do you address the overflow problem here?