C Program to Convert Decimal number into Binary Number

Program to Convert Decimal number into Binary : Number System : Download

#include<stdio.h>
#include<conio.h>
#include<math.h>

void dec_bin(long int num)   // Function Definition
{
long int rem[50],i=0,length=0;
while(num>0)
 {
 rem[i]=num%2;
 num=num/2;
 i++;
 length++;
 }
printf("nBinary number : ");
     for(i=length-1;i>=0;i--)
             printf("%ld",rem[i]);
}
//================================================
void main()
{
long int num;
clrscr();

 printf("Enter the decimal number : ");
 scanf("%ld",&num);

    dec_bin(num);   // Calling function

 getch();
}

#include<stdio.h>

#include<conio.h>

#include<math.h>

void dec_bin(long int num) // Function Definition

{

long int rem[50],i=0,length=0;

while(num>0)

{

rem[i]=num%2;

num=num/2;

i++;

length++;

}

printf("nBinary number : ");

for(i=length-1;i>=0;i--)

printf("%ld",rem[i]);

}

//================================================

void main()

{

long int num;

clrscr();

printf("Enter the decimal number : ");

scanf("%ld",&num);

dec_bin(num); // Calling function

getch();

}

Output :

Enter the decimal number : 7
Octal number : 111

1 2	Enter the decimal number : 7 Octal number : 111

Explanation of Program :

Always Program execution starts from main function. Inside Main function we are accepting the decimal number.

printf("Enter the decimal number : ");
scanf("%ld",&num);

1 2	printf("Enter the decimal number : "); scanf("%ld",&num);

Now after accepting the input decimal number we pass the decimal number to function dec_bin(num) function using following syntax.

dec_bin(num);   // Calling function

1	dec_bin(num); // Calling function

Inside the Function Call –

We have declared some variables and the use of each variable is listed in following table –

Variable	Data Type	Initial Value	Use of Variable
rem[50]	long int	Garbage	Storing the Remainder
i	long int	0	Subscript Variable for Running Loop
length	long int	0	Storing the Length of the Array

We are following steps until the number becomes 0 or less than 0 –
[box]Step 1 : Check Whether the Number is Less than or Equal to Zero [/box]
[box]Step 2 : Divide the number by 2 and store the remainder in the array [/box]

while(num>0)
 {
 rem[i]=num%2;
 num=num/2;
 i++;
 length++;
 }

while(num>0)

{

rem[i]=num%2;

num=num/2;

i++;

length++;

}

[box]Step 3 : Increase the length of the array by 1 and also increment the subscript variable[/box]
After the execution of while loop print the array in reverse order.

Download Decimal to Binary Code :

[box]Download Code [/box]

Table of Content