Number System.text

#include<stdio.h>
#include<conio.h>
#include<math.h>
#include<string.h>
#include<stdlib.h>
int main()
{
double n,bin,f1=0.0,f2,f3=0.1,oct,i;
    int x,x1=0,choice1,no,div,j,a[100],hex,BS;
    int fact=1,rem,temp,decimal=0,octal_num[25],ch2;
    int decimal_val = 0, base = 1,val,len,binary_num,binary_val,octal_val;
    char binarynum[25], hexa[25];
    long long place,octal,tempOctal,binary;
    int OCTALVALUES[] = {0, 1, 10, 11, 100, 101, 110, 111};
    long long dec=0;
    long int bin1,bin2,bn,n1,n2,os;  int summ[20];
    int oct1, oct2; int first_temp, second_temp;
    int  max,min,carry=0,sum=0,mid,one=1,choice3,sum2=0;
    char hex1[100], hex2[100], hex3[100];
    int p = 0,q=0,ch3;
    int decimal1 = 0, decimal2 = 0;
    int r,ii,jj=0;
     long decimalnum, quotient;
     clrscr();

     	printf(" PRESS(1)Conversion of Decimal number\n");
	printf(" PRESS(2)Conversion of Binary number\n");
	printf(" PRESS(3)Conversion of Octal number\n");
	printf(" PRESS(4)Conversion of Hexadecimal number\n");
	printf(" PRESS(5)For addition operation b\w two numbers\n");
	printf(" PRESS(6)For subtraction operstion b\w two numbers\n");

	printf("Enter your choice:");
	    scanf("%d",&choice1);
 switch(choice1)
	{
  case 1://conversion of Decimal number//

	printf("Press(1)Convert to octal\n");
	printf("Pess(2)Convert to hexadecimal\n");
	printf("Press(3)Convert to binary\n");
	printf("Enter your choice\n");
	scanf("%d",&ch2);

	switch(ch2)
	{

	case 1://Decimal to Octal//
	       printf("Enter a number in decimal:");
	       scanf("%lf",&n);
	       x=n;
	       f2=n-x;
	       while(x!=0)
		{
		rem=x%8;
		x1=x1+rem*fact;
		x=x/8;
		fact=fact*10;
		}
	       for(i=1;i<=3;i++)
		{
		f2=f2*8;
		temp=f2;
		f1=f1+f3*temp;

		if(temp==1)
		{
		f2=f2-temp;
		f3=f3/10;
		}
	}
	oct=x1+f1;
	printf("Equivalent octal number is= %lf",oct);
		break;

	case 2: //Decimal to hexadecimal//
		 printf("Enter a number in decimal:");
		 scanf("%d",&no);
		 printf("Equivalent Hexadecimal number is= %X",no);
		 break;

	case 3: //Deciaml to Binary//
		  printf("Enter a number in decimal:");
		  scanf("%d",&no);
		  for(i=0;no>0;i++)
		  {
		  a[i]=no%2;
		  no=no/2;
		  }
		  printf("Equivalent binary number is=");
		  for(i=i-1;i>=0;i--)
		  {
		  printf("%d",a[i]);
		  }
		   break;
  default:printf("INVALID CHOICE");
	}
  break;
	 //conversion of binary number//
case 2: printf("1.Convert to octal\n");
	printf("2.Convert to hexadecimal\n");
	printf("3.Convert to Decimal\n");
	printf("Enter your choice\n");
	scanf("%d",&ch3);

      switch(ch3)
      {
	case 1:  //Binary to Octal//
		 printf("Enter a binary number:\n");
		 scanf("%ld", &n1);
		 binary_val = n1;
		 while (n1 > 0)
		{
		  rem = n1 % 10;
		  decimal_val = decimal_val + rem * base;
		  n1= n1 / 10 ;
		  base = base * 2;
		}
		i=1;
		while(decimal_val!=0)
		{
		  rem=decimal_val%8;
		  div=decimal_val/8;
		  a[i]=rem;
		  i++;
		  decimal_val=div;
		}
		printf("Octal number is=");
		for(j=i-1;j>0;j--)
		{
		 printf("%d",a[j]);
		}
	break;

      case 2: //Binary to Hexadecimal//
	   printf("Enter the binary number:\n");
	   scanf("%ld", &bn);
	   j=1;
	   hex=0;
	   while (bn!= 0)
	   {
	    rem = bn % 10;
	    hex = hex + rem * j;
	    j = j * 2;
	    bn =bn/10;
	   }
	   printf("Equivalent hexadecimal value= %X ", hex);
     break;

     case 3: //Binary to Decimal//
	printf("Enter a binary number:\n");
	scanf("%d", &no);
	while (no > 0)
	{
	  rem = no % 10;
	  sum= sum + rem * base;
	  no= no / 10 ;
	  base = base * 2;
	}
	printf("Its decimal equivalent is = %d",sum);
	break;
	default:printf("INVALID CHOICE");
	}
 break;

case 3: // conversion of octal//

	printf("Press(1)Convert octal to hexadecimal\n");
	printf("Press(2)Convert octal to binary\n");
	printf("Press(3)Convert octal to decimal\n");
	printf("Enter your choice:\n");
	scanf("%d",&ch2);
	switch(ch2)
       {
	case 1: //Octal to Hexadecimal//
		  place = 1;
		  binary = 0;

		 //INPUT OCTAL NUMBER FROM USER
		  printf("Enter any octal number: ");
		  scanf("%lld", &octal);
		  tempOctal = octal;

		 //Octal to binary conversion
		  while(tempOctal > 0)
		  {
		  rem = tempOctal % 10;
		  binary = (OCTALVALUES[rem] * place) + binary;
		  tempOctal /= 10;
		  place *= 1000;
		  }


		   //Binary to hexadecimal conversion

		   while(binary > 0)
		   {
		    rem = binary % 10000;
		    switch(rem)
		      {
			case 0:strcat(hexa, "0");
		    break;
			case 1:strcat(hexa, "1");
		    break;
			case 10:strcat(hexa, "2");
		    break;
			case 11:strcat(hexa, "3");
		    break;
			case 100:strcat(hexa, "4");
		    break;
			case 101:strcat(hexa, "5");
		    break;
			case 110:strcat(hexa, "6");
		    break;
			case 111:strcat(hexa, "7");
		    break;
			case 1000:strcat(hexa, "8");
		    break;
			case 1001:strcat(hexa, "9");
		    break;
			case 1010:strcat(hexa, "A");
		    break;
			case 1011:strcat(hexa, "B");
		    break;
			case 1100:strcat(hexa, "C");
		    break;
			case 1101:strcat(hexa, "D");
		    break;
			case 1110:strcat(hexa, "E");
		    break;
			case 1111:strcat(hexa, "F");
		    break;
		   }
		 binary /= 10000;
		 }
	     strrev(hexa);
	     printf(" Equivalent Hexadecimal number= %s", hexa);

	break;

	case 2: //Octal to Binary//
		  printf("Enter an octal number: ");
		  scanf("%d", &no);
		  temp = no;
		  i=0;
		  while (temp != 0)
		  {
		    decimal += (temp % 10) * pow(8, i);
		    ++i;
		    temp /= 10;
		  }

		printf("Equivalent binary number= ");
		while (decimal != 0)
		{
		octal_num[j] = decimal % 2;
		decimal = decimal / 2;
		++j;
		}
		for (i = j - 1; i >= 0; i--)
		{
		printf("%d", octal_num[i]);
		printf("");
		}

	 break;

	 case 3: //Octal to Decimal//
		printf("Enter a octal number:\n");
		scanf("%d", &no);
		octal_val = no;
		while (no > 0)
		{
		rem = no % 10;
		decimal_val = decimal_val + rem * base;
		no= no / 10 ;
		base = base * 8;
		}
		printf("Its decimal equivalent is = %d \n", decimal_val);
	 break;
	 default:printf("INVALID CHOICE");
	}
 break;
   case 4://CONVERSION OF HEXADECIMAL//
	    printf("Press(11)Convert to octal\n");
	    printf("Press(12)Convert to binary\n");
	    printf("Press(13)Convert to decimal\n");
	    printf("Enter your choice:\n");
	    scanf("%d",&ch2);
	    switch(ch2)
		{
	 case 11://Hexadecimal to octal
		  printf("Enter hexadecimal value:");
		  scanf("%X",&hex);
		  oct1=hex;
		  printf("Equivalent octal value is %o",oct1);
	break;

	case 12: //hexadecimal to Binary//
		printf("Enter the value for hexadecimal: ");
		scanf("%s",&hexa);
		i=0;
		printf("\n Equivalent binary value= ");
		while (hexa[i])
		{
		switch (hexa[i])
		{
		case '0':printf("0000");
			 break;
		case '1':printf("0001");
			 break;
		case '2':printf("0010");
			 break;
		case '3':printf("0011");
			 break;
		case '4':printf("0100");
			 break;
		case '5':printf("0101");
			 break;
		case '6':printf("0110");
			 break;
		case '7':printf("0111");
			 break;
		case '8':printf("1000");
			 break;
		case '9':printf("1001");
			 break;
		case 'A':printf("1010");
			 break;
		case 'B':printf("1011");
			 break;
		case 'C':printf("1100");
			 break;
		case 'D':printf("1101");
			 break;
		case 'E':printf("1110");
			 break;
		case 'F':printf("1111");
			 break;
		case 'a':printf("1010");
			 break;
		case 'b':printf("1011");
			 break;
		case 'c':printf("1100");
			 break;
		case 'd':printf("1101");
			 break;
		case 'e':printf("1110");
			 break;
		case 'f':printf("1111");
			 break;
		default:
		printf("\n Invalid hexa digit %c ", hexa[i]);
		break;
	       }
	       i++;
	       }
	break;

	case 13: //Hexadecimal to Decimal//
		 place = 1;
	       // Input hexadecimal number from user
		 printf("Enter any hexadecimal number:");
		 scanf("%s",hexa);
	       //Find the length of total number of hex digit
		len = strlen(hexa);
		len--;
		// Iterate over each hex digit
		for(i=0; hexa[i]!='\0'; i++)
		{
		//Find the decimal representation of hex[i]
		if(hexa[i]>='0' && hexa[i]<='9')
		 {
		  val = hexa[i] - 48;
		 }
		else if(hexa[i]>='a' && hexa[i]<='f')
		 {
		  val = hexa[i] - 97 + 10;
		 }
		else if(hexa[i]>='A' && hexa[i]<='F')
		{
		 val = hexa[i] - 65 + 10;
		}
	       dec += val * pow(16, len);
	       len--;
	       }
	       printf("Equivalent Decimal number = %lld", dec);
       break;
	      default:printf("INVALID CHOICE");
	}
 break;

     case 5 : //ADDITION OPERATION ON NUMBERS//
	 printf("Press(1)Addition of two binary numbers\n");
	 printf("Press(2)Addition of two octal numbers\n");
	 printf("Press(3)Addition of two hexadecimal numbers\n");
	 printf("Enter your choice\n");
	 scanf("%d",&choice3);
	 switch(choice3)
	 {
	   case 1: //Addition of two binary numbers//
		i=0,rem = 0;
		printf("Input first binary number: ");
		scanf("%ld",&bin1);
		printf("Input second binary number: ");
		scanf("%ld",&bin2);
		while(bin1!=0||bin2!=0)
		{
		 summ[i++] =  (bin1 %10 + bin2 %10 + rem ) % 2;
		 rem = (bin1 %10 + bin2 %10 + rem ) / 2;
		 bin1 = bin1/10;
		 bin2 = bin2/10;
		}
		if(rem!=0)
		{
		 summ[i++] = rem;
		 --i;
		}
		printf("Addition of two binary numbers: ");
		while(i>=0)
		printf("%d",summ[i--]);

	 break;

	 case 2: //Addition of two octal numbers//
		printf("Enter first octal number : ");
		scanf("%d", &oct1);
		printf("Enter second octal number : ");
		scanf("%d", &oct2);
		if(oct1 > oct2)
		{
		 max = oct1; min = oct2;
		}
		else
		{
		max=oct2; min=oct1;
		}
		while(max>0)
		{
		first_temp = max%10;
		max=max/10;
		second_temp = min%10;
		min = min/10;
		mid = (first_temp+second_temp+carry)%8;
		carry = (first_temp+second_temp+carry)/8;
		sum=one*mid+sum;
		one=one*10;
		if(max==0 && carry>0)
		{
		sum =one*carry+sum;
		}
		}
		printf("Octal Number Addition:= %d", sum);

    break;

     case 3: //Addition of two Hexadecimal numbers//
		printf("Enter first Hexadecimal: ");
		scanf("%s", hex1);
		printf("Enter second Hexadecimal: ");
		scanf("%s", hex2);
		for(i=strlen(hex1)-1;i>=0;--i)
		{
		if(hex1[i]>='0'  &&  hex1[i]<='9')
		{
		r=hex1[i]-'0';
		}
		else
		{
		r=hex1[i]-'A'+10;
		}
		decimal1 = decimal1 +r*pow(16,p);
		++p;
		}
		for(j=strlen(hex2)-1;j>=0;--j)
		{
		if(hex2[j]>='0'  &&  hex2[j]<='9')
		{
		r=hex2[j]-'0';
		}
		else
		{
		r=hex2[j]-'A'+10;
		}
		decimal2 = decimal2 +r*pow(16,q);
		++q;
		}
		sum = decimal1 + decimal2;
		quotient = sum;
	 //printf("\n Quotient is: %ld", quotient);
		while(quotient != 0)
		{
		rem = quotient % 16;
		if(rem < 10)
		{
		hex3[jj++] = 48 + rem;
		}
		else
		{
		hex3[jj++] = 55 + rem;
		}
		quotient = quotient/16;
		}
		jj--;
		printf("Sum of two hexadecimal number is: ");
		for(ii=jj; ii>=0; ii--)
		{
		printf("%c", hex3[ii]);
		}
	  break;
	  default:printf("INVALID CHOICE");
	  }
break;
   case 6://SUBTRACTION OF TWO NUMBERS//
	  printf("Press(11) for subtraction of two binary numbers\n");
	  printf("Press(12) for subtraction of two octal numbers\n");
	  printf("Press(13) for subtraction of two hexadecimal numbers\n");
	  scanf("%d",&ch3);
	  switch(ch3)
	  {
	  case 11:// SUBTRACTION OF BINARY NUMBERS
		 printf("Enter first binary number:\n");
		  scanf("%d",&n1);
		  //binary to decimal
		  while (n1 > 0)
		{
		rem = n1%10;
		sum= sum + rem * base;
		n1= n1 / 10 ;
		base = base * 2;
		}
		printf("Enter second binary number:\n");
		scanf("%d",&n2);
		//binary to decimal
		rem=0;
		base=1;
		while (n2 > 0)
		{
		rem = n2 % 10;
		sum2= sum2 + rem * base;
		 n2 = n2 / 10 ;
		base = base * 2;
		}
		BS=(sum-sum2);

		//decimal to binary
		for(i=0;BS>0;i++)
		  {
		  a[i]=BS%2;
		  BS=BS/2;
		  }
		  printf("Subtraction difference is=");
		  for(i=i-1;i>=0;i--)
		  {
		  printf("%d",a[i]);
		  }
	 break;
	 case 12://SUBTRACTION OF TWO OCTAL NUMBERS
		printf("enter 1 octal number");
		scanf("%o",&n1);
		printf("enter 2 octal number");
		scanf("%o",&n2);
		os=n1-n2;
		printf("octal subtraction=%o",os);

	break;
	}
	 case 13://SUBTRACTION OF TWO HEXADECIMAL NUMBERS
		printf("Enter 1 hexadecimal value");
		scanf("%X",&n1);
		printf("Enter 2 hexadecimal value");
		scanf("%X",&n2);
		hex=n1-n2;
		printf("hexadecimal subtraction is %X",hex);
  break;
  default:printf("INVAlID CHOICE");
  }
	getch();
        return (0);
	}