#include <stdio.h>
#include <stdlib.h>
#include <strings.h>

int main(int argc, char *argv[])
{
double num;
long dec;
double frac;
char decstr[1024], *decptr, fracstr[1024], *fracptr, *fracendptr;
printf("
Please enter a decimal number: ");
scanf("%lf", &num);
dec = (long)((long)num);
frac = num - (double)dec;

bzero(decstr, sizeof(decstr)); decptr = decstr + sizeof(decstr) - 1;
while(dec > 0 && decptr > decstr)
{
decptr--;
if(dec%2)
*decptr = '1';
else
*decptr = '0';
dec = dec/2;
}
if(decptr <= decstr)
{
printf("Oops...Buffer offerflow prevented. Terminating.");
exit(-1);
}
bzero(fracstr, sizeof(fracstr)); fracptr = fracstr; fracendptr = fracstr + sizeof(fracstr) - 1;
while(frac > 0 && fracptr < fracendptr)
{
frac = frac*2;
if((int)(frac))
*fracptr = '1';
else
*fracptr = '0';
frac = frac - (double)((int)frac);
fracptr++;
}
if(fracptr >= fracendptr)
{
printf("Oops...Buffer offerflow prevented. The fractional part may not be exactly accurate. But its pretty close.
");
}
printf("
Binary: %s.%s", decptr, fracstr);
return 0;
}

#include<stdio.h>
void bin(int);
int main()
{int n;
printf("enter the decimal number you want to convert into binary");
scanf("%d",&n);
bin(n);
}

void bin(int n)
{ int k;
if(n<=1)
printf("%d",n);
else
{
k=n;
bin(n/2);
printf("%d",k%2);
}
}

#include<stdio.h>
main()
{
int i,j,n,b[20];
clrscr();
printf("enter the decimal number");
scanf("%d",n);
for(i=0;i<n;i++)
{
b[i]=n%2;
n=n/2;
}
for(j=n;j>0;j--)
{
printf("%d",b[j]);
}
getch();
}

#include<stdio.h>
#include<conio.h>
void main ()
{
int a,b,ans=0;
printf("enter value to convert in binary");
scanf("%d",&a);
while(a!=0)
{
b=a%2;
a=a/2;
ans=ans*10+b;
}
printf("ans is %d",ans);
getch();
}


we can use long for big number

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

void main()
{
int num,i,binary[20];
clrscr();

printf("
Enter a number:: ");
scanf("%d",&num);

for(i=0;i<16;i++)
{
binary[i]= (num>>(15-i) & 1)? 1 : 0;
}

printf("
Binary number is
");

for(i=0;i<16;i++)
printf("%d",binary[i]);

getch();
}

#include<stdio.h>
void main()
{
int num,i,f,size;
int k;
int count=0;
int ass=15;

int arr[16];
printf("Enter your number : ");
scanf("%d",&num);
for(i=num;i>=1;i/=2)
{
f = i%2 ;
printf(" %d",f);
for(k=0;k<=ass;k++)
{
arr[k] = f;
}
ass = ass - 1;
count = count + 1;
size = 15-count;
for(k =0;k<=size;k++)
arr[k] = 0;

}
printf("
");
printf("
for a 16bit compiler
");

for(k=0;k<=15;k++)
printf(" %d ",arr[k]);


}

let the no is n the the code for it is
int k=1,s=0,d;
while(n>0)
{
d=n%2;
s=s+d*k;
n=n/2;
k=k*10;
}
printf("%d",s);

s contains the binary equivalent of entered decimal no.

/*decimal to binary conversion*/
#include<stdio.h>
main()
{
long a,d,bin=0,b=1;
int rem;
printf("enter a decimel integer
");
scanf("%ld",&a);
d=a;
while(a>0)
{
rem=a%2;
bin=bin+rem*b;
a=a/2;
b=b*10;
}
printf("decimal integer number is=%ld
",d);
printf("binary equivalent is=%ld
",bin);
}

void showbits(int n)
{
int i = 0;
while(i < (sizeof(n) * 8))
{
printf("%d ",(n & ~(~0u>>1) ? 1 : 0));
n = n<<1;
i++;
}
}

#include <stdio.h>
int main()
{
unsigned int num = 12345;
unsigned int count = 1;

count = count << ((sizeof(int)*8) - 1);

printf("input: %d
output: ", num);

while (count)
{
if (num & count)
{
printf("1");
}
else
{
printf("0");
}
count = count >> 1;
}
printf ("
");

return 0;
}


sample output
==============
[aneebk@localhost interview]$ cc to_convert_dec_to_binary.c
[aneebk@localhost interview]$ ./a.out
input: 12345
output: 00000000000000000011000000111001
[aneebk@localhost interview]$

#include<stdio.h>
#include<conio.h>
bin(int no);
void main()
{
int no;
clrscr();
printf("enter decimal no
");
scanf("%d",&no);
bin(no);
getch();
}
bin(int no)
{
int a;
if(no==0)
{
return(1);
}
else
{
a=no%2;
no=no/2;
bin(no);
}
printf("%d",a);
}

#include<stdio.h>
int a = 32;

for(i=0;i< (sizeof(a)*8) ; i++ ) {
printf("%d",(a<<i & 1<<31)?1:0);
}
return 0;
}

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