Convert decimal to binary in C

Question

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 de         


        

Answer 1

Here is the 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.

You can check c program here http://www.techcrashcourse.com/2015/08/c-program-to-convert-decimal-number-binary.html

Answer 2

int main() 
{ 
 int n, c, k;
 printf("Enter an integer in decimal number system: ");
 scanf("%d", &n);
 printf("%d in binary number system is: ", n);
 for (c = n; c > 0; c = c/2) 
  {
   k = c % 2;//To
   k = (k > 0) ? printf("1") : printf("0");
  }
 getch();
 return 0; 
}

Answer 3

//C Program to convert Decimal to binary using Stack

#include<stdio.h>

#define max 100

int stack[max],top=-1,i,x;  


void push (int x)
{
  ++top;
  stack [top] = x;
}

int pop ()
{ 
   return stack[top];
}   


void  main()
{
  int num, total = 0,item;
  print f( "Please enter a decimal: ");
  scanf("%d",&num);
  while(num > 0)
  {  
    total = num % 2;
    push(total);
    num /= 2;
  }



 for(i=top;top>-1;top--)
 {     
     item = pop ();
     print f("%d",item);
 }

 }

Answer 4

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;
}

Answer 5

You can do it using while loop under a function also. I was just searching the solve for mine but the solves i get were not suitable, so I have done it accordingly the practical approach (divide using 2 until getting 0 and store the reminder in an array) and print the reverse of the array and Shared Here

#include <stdio.h>

    int main()
    {
        long long int a,c;
        int i=0,count=0;
        char bol[10000];
        scanf("%lld", &a);
        c = a;
        while(a!=0)
        {
            bol[i] = a%2;
            a = a / 2;
            count++;
            i++;
        }
        if(c==0)
        {
            printf("0");
        }
        else
        {
            for(i=count-1; i>=0; i--)
            {
                printf("%d", bol[i]);
            }
        }
        printf("\n");
        return 0;
    }

Answer 6

First of all 192cannot 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;  
}