Decimal to Binary, Decimal to Octal, Decimal to Hexadecimal

Convert Decimal to Binary, Decimal to Octal, Decimal to Hexadecimal using C Programming.

void main()

{
int bin[20],oct[20];
char hex[20];
int i=0,j=0,h=0,k,m,l,dec,dec1,dec2,r;
clrscr();

printf("\n\n\t\tSay thanks to Ashish Ranjan !!!");

printf("\n\n\t\tEnter your Number : ");
scanf("%d",&dec);
printf("\n\t\tDecimal Number : %d\n\n ",dec);


dec1=dec2=dec;
//----------------------Binary--------------------------------------


while( dec != 0)
{
   k=dec/2;
   bin[i]=dec%2;
   dec=k;
   i++;
 //  printf("\n quo = %d,\trem = %d,\tdividend = %d,\ti = %d",k,bin[i-1],dec,i);
}


printf("\n\n\n\t\tBinary Represnetation :  ");
for(i=i;i!=0;i--)
    {printf(" %d",bin[i-1]);}




//----------------------Octal---------------------------------------
 printf("\n\n\n");
while( dec1 != 0)
{
   m=dec1/8;
   oct[j]=dec1%8;
   dec1=m;
   j++;
//  printf("\n quo = %d,\trem = %d,\tdividend = %d,\tj = %d",m,oct[j-1],dec1,j);
}


printf("\n\n\t\tOctal Represnetation :  ");
for(j=j;j!=0;j--)
    {printf(" %d",oct[j-1]);}
//------------------------HexaDecimal-------------------------------


 printf("\n\n\n");
while( dec2 != 0)
{
   l=dec2/16;
   r=dec2%16;
    if(r<10)
   { hex[h]=r; }
   else if(r==10)
   { hex[h]='A';}
   else if(r==11)
   { hex[h]='B';}
   else if(r==12)
   { hex[h]='C'; }
   else if(r==13)
   { hex[h]='D'; }
   else if(r==14)
   { hex[h]='E'; }
   else if(r==15)
   { hex[h]='F'; }


   dec2=l;
   h++;
//  printf("\n quo = %d,\trem = %d,\tdividend = %d,\th = %d\thd = %d",l,r,dec2,h,hex[h-1]);
}


printf("\n\n\t\tHexadecimal Represnetation :  ");
for(h=h;h!=0;h--)
    { if(hex[h-1]>10)
      printf(" %c",hex[h-1]);
      else
      printf(" %d",hex[h-1]);
    }
 getch();
}

Triangle Pattern using for loops

How do you create a Triangle Pattern using for loops?

 

#include<stdio.h>

#include<conio.h>

void main ()

{

int pas,i,j,k;

clrscr();

printf("\n\n\tEnter the size of pascal triangle (upto 99) : ");

scanf("%d",&pas);

printf("\n\n\n");

for(i=1;i<=pas;i++)

   {

    for(j=pas;j>i;j--)

       {

printf(" ");  }

    for(k=1;k<=i;k++)

       {

printf("%2d",i);  
// printf(" *",i);    /* to print the pattern with asterisk
                            uncomment it and comment the above 
                            statement */

       }

    printf("\n");

   }

printf("\n\n\n\t  Pascal Triangle %d",pas);

getch ();

}