c program to convert decimal to binary

[Oswaldo]

I am studying inF.Y.B.Sc. I.T.and I got a assignment from college to create a program using C language that converts decimal number into binary number. I think it is very troublesome so suggest any function that convert decimal number into binary number. If there is no function then give me code.

[Praetor]

code to convert decimal number to binary number

#include <stdio.h>

 void dec_bin(int num);

  int main(void) 
{
   int m = 0;

    printf("Digit (0-255): ");
    scanf("%d", &m);
 
   (m >= 0) && (m < 256) ? dec_bin(m) : exit(1);

   return 0;
}

  void dec_bin(int num) 
{
 int x, y;
 x = y = 0;

 for(y = 7; y >= 0; y--)
 {
  x = num / (1 << y);
  num = num - x * (1 << y);
  printf("%d", x);
 }

 printf("\n");
}

[Katty]

#include <stdio.h>
void dec2bin(long deci, char *bin);
int main()
{
    long dec;
    char bin[80];
    printf("\n\n Enter an integer value : ");
    scanf("%ld",&deci);
    dec2bin(deci,bin);
    printf("\n The binary value of %ld is %s \n",deci,bin);
    getchar(); 
    getchar();
    return 0;
}

void dec2bin(long deci, char *bin)
{
   int k = 0, n = 0;
   int neg_flag = 0;
   int remain;
   int old_deci; 
   char temp[80];

if (deci < 0)
{
  deci = -deci;
  neg_flag = 1;
}

do
{
   old_deci = deci; 
   remain = deci % 2;
   deci = deci / 2;
   printf("%d/2 = %d remainder = %d\n", old_deci, deci, remain);
   temp[k++] = remain + '0';
} while (deci > 0);

 if (neg_flag)
    temp[k++] = '-'; 
else
    temp[k++] = ' '; 

 while (k >= 0)
{
    bin[n++] = temp[--k];
    bin[n-1] = 0; 
}
}

[kelfro]

#include<stdio.h>
#include<conio.h>
void showbits(int m)
{
       if(m==1)
       printf("%d",m);
      else
    {
      showbits(m/2);
      printf("%d",m%2);
    }
}
void main()
{
       int n;
       void showbits(int m);
       clrscr();
       printf("Number?");
       scanf("%d",&n);
       printf("\nBin eq of %d is ",n);
       showbits(n);
       getch();
}