Decimal to Binary Conversion in C#

/*
Summary: Converts decimal number which is base 10 number system
0-9 to hexadecimal which uses the digits
from 0 to 9 and A, B, C, D, E, F..
*/

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

void main()
{
long int num;
clrscr();

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

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

while(num>0)
{
rem[i]=num%16;
num=num/16;
i++;
length++;
}

printf("Hexadecimal number : ");
for(i=length-1;i>=0;i--)
{
switch(rem[i])
{
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("%ld",rem[i]);
}
}

getch();
}








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