Conversion of Numbers in C

Number Conversion Program in C

With the help of C Language you can convert any number from decimal to binary and binary to decimal, binary to octal, binary to hexadecimal, decimal to octal and etc..

Decimal to Binary Conversion

Decimal number have base 10 and Binary number have base 2.

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

void main()
{
int no,rem[20],i=0,j;
clrscr();
printf("Enter any number: ");
scanf("%d",&no);
while(no>0)
{
rem[i]=no%2;
i++;
no=no/2;
}
printf("Binary number is: ");
for(j=i-1;j>=0;j--)
{
printf(" %d",rem[j]);
}
getch();
}

Enter any number: 7
Binary number is: 111

Decimal to octal conversion

Decimal number have base 10 and Octal number have base 8.

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

void main()
{
int no,rem[20],i=0,j;
clrscr();
printf("Enter any number: ");
scanf("%d",&no);
while(no>0)
{
rem[i]=no%8;
i++;
no=no/8;
}
printf("Octal number is:");
for(j=i-1; j>=0; j--)
{
printf("  %d",rem[j]);
}
getch();
}

Enter any number: 23
Octal number is: 2  7

Decimal to Hexadecimal Conversion

Decimal number have base 10 and Hexadecimal number have base 16.

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

void main()
{
int num,rem[20],hex=0,i=0,j;
clrscr();
printf("Enter any number: ");
scanf("%d",&num);
while(num>0)
  {
    rem[i] = num % 16;
    num = num / 16;
    i++;
  }
printf("Hexadecimal number: ");
for(j=i-1; j>=0 ; j--)
  {
    switch(rem[j])
    {
      case 10:
	  printf("A");
	  break;
      case 11:
	  printf("B");
	  break;
      case 12:
	  printf("C");
	  break;
      case 13:
	  printf("D");
	  break;
      case 14:
	  printf("E");
	  break;
      case 15:
	  printf("F");
	  break;
      default :
	 printf("%d",rem[j]);
    }
  }
getch();
}

Enter any number: 231
Hexadecimal number: E7