Create a c++ program which:
1. Displays a menu: 1) Decimal to Binary • 2) Binary to Decimal • 3) Decimal to Hex • 4) Hex to Decimal • 9) Exit Program
2. For Menu item #1: Ask the user for a Decimal number. If they type a negative number, go back to step #1 1. Convert the Decimal number to binary and display it.
3. For Menu item #2: Ask the user for a binary number (1's and 0's). If they type something other than 1's and 0's, give them an error message and try again (step #1) 1. Convert the binary number to decimal and display it. 2. Note: Cap the length of the binary number to 8 bits. If they type more than that, give them an error message and go back to #1
4. For Menu item #3: Ask the user for a Decimal number. If they type a negative number, go back to step #1 1. Convert the Decimal number to hexadecimal and display it.
5. For Menu item #4: Ask the user for a hexadecimal number (0-9, a, b, c, d, e, f). If they type something other than any of those, give them an error message and try again (step #1) 1. Convert the hexadecimal number to decimal and display it. 2. Note: Cap the length of the hexadecimal digits 4 digits. If they type more than that, give them an error message and go back to #1
6. For Menu item #9, end the program
B. Notes: • Menu #1 should be a function called decimalToBinary • Menu #2 should be a function called binaryToDecimal • Menu #3 should be a function called decimalToHex Menu #2 should be a function called hexToDecimal
C++ CODE:
#include<iostream>
#include<sstream>
#include<cstring>
#include<bits/stdc++.h>
using namespace std;
void decimal_binary(int n)
{
int arr[10];
int i;
for(i=0; n>0; i++)
{
//dividing by two and get the
remainder stored in the array
arr[i]=n%2;
n= n/2;
}
cout<<"Binary of the given number= ";
//printing the binary number from the array
for(i=i-1 ;i>=0 ;i--)
{
cout<<arr[i];
}
cout<<"\n";
}
void binary_decimal(string bin)
{
//creating object to convert string into int
stringstream obj(bin);
//getting the integer from the object
int x=0;
obj >> x;
//temporary variables
int num = x;
int decimal = 0;
int t = num;
int last;
// base value to 1, that is 2^0
int base = 1;
while (t)
{
//getting the last digit
last = t % 10;
//dividing the given
number by 10
t = t / 10;
// calculating the power of base
for last digit
// then the value is added to
decimal
decimal += last *
base;
//incrementing the base by 2
base = base * 2;
}
//displaying the decimal value
cout<<"Decimal equivaluent of the given
binary= "<<decimal;
cout<<"\n";
}
void decimal_hexa(int n)
{
// array to store hexadecimal number
char hexa[100];
// counter for array
int i = 0;
while(n!=0)
{
// variable to store
remainder
int temp = 0;
// storing remainder in
tempoarary variable.
temp = n % 16;
// check if temp <
10
if(temp < 10)
{
hexa[i] = temp + 48;
i++;
}
else
{
hexa[i] = temp + 55;
i++;
}
n = n/16;
}
// printing array in reverse order
cout<<"Hexadecimal equivalent of the given
decimal= ";
for(int j=i-1; j>=0; j--)
cout <<
hexa[j];
cout<<"\n";
}
void hexadecimal_binary(string hexVal)
{
//finding the length of the string
int len = hexVal.length();
//converting the string to uppercase
transform(hexVal.begin(), hexVal.end(),
hexVal.begin(), ::toupper);
// Initializing base value to 1, that is
16^0
int base = 1;
int dec_val = 0;
// getting characters as digits from last
character
for (int i=len-1; i>=0; i--)
{
// if character are
'0'-'9', converted to number
// 0-9 by subtracting 48
from ascii value.
if (hexVal[i]>='0'
&& hexVal[i]<='9')
{
dec_val += (hexVal[i] - 48)*base;
// incrementing base by power
base = base * 16;
}
// if character are 'A'-'F',
converted to number
// 10-15 by subtracting
55 from ascii value.
else if
(hexVal[i]>='A' && hexVal[i]<='F')
{
dec_val += (hexVal[i] - 55)*base;
// incrementing base by power
base = base*16;
}
}
//displaying the decimal value
cout<<"Decimal equivalent of the given
hexadecimal= "<< dec_val;
cout<<"\n";
}
int main()
{
int choice;
int n;
string bin,hexa;
while(1)
{
cout<<"\nChoose any one of
the following:"<<endl;
cout<<"1.Decimal to
Binary"<<endl;
cout<<"2.Binary to
Decimal"<<endl;
cout<<"3.Decimal to
Hexadecimal"<<endl;
cout<<"4.Hexadecimal to
Decimal"<<endl;
cout<<"5.Exit"<<endl;
cout<<"\n"<<endl;
cout<<"Enter your choice:
";
cin>>choice;
switch(choice)
{
//for decimal to
binary
case 1:
while(1)
{
//getting
a number from the user
cout<<"Enter a decimal number: ";
cin>>n;
//checking
for valid input
if(n<0)
{
cout<<"Error: Enter a positive
numbers\n"<<endl;
}
else
break;
}
//calling the function
decimal_binary(n);
break;
//binary to
decimal
case 2:
while(1)
{
int
i=0;
//getting
the binary number from the user
cout<<"Enter a binary number: ";
cin>>bin;
//falg
variable
bool
flag=true;
//checking
for valid binary digits
while (i
< bin.length())
{
if( bin.at(i) != '1'
&& bin.at(i) != '0' )
{
flag =
false;
}
i++;
}
//
printing the error message
if
(flag==false)
{
cout<<"Error: please enter a valid binary
number\n"<<endl;
continue;
}
else
if(i>8)
{
cout<<"Error: Please binary digits of 8
only\n"<<endl;
continue;
}
else
break;
}
//calling the function
binary_decimal(bin);
break;
case 3:
while(1)
{
//getting
decimal input from the user
cout<<"Enter a decimal number: ";
cin>>n;
//checking
for valid decimal input
if(n<0)
{
cout<<"Error: Enter a positive
numbers\n"<<endl;
}
else
break;
}
//calling the function
decimal_hexa(n);
break;
case 4:
while(1)
{
int
i=0;
//getting
the hexadecimal number from the user
cout<<"Enter a hexadecimal number: ";
cin>>hexa;
//falg
variable
bool
flag=true;
//checking
for valid hexadecimal number
while (i
< hexa.length())
{
if( !isxdigit(hexa[i]))
{
flag =
false;
}
i++;
}
//displaying the error message
if
(flag==false)
{
cout<<"Error: please enter a valid
hexadecimal number\n"<<endl;
continue;
}
else
if(i>4)
{
cout<<"Error: Please hexadecimal digits of
4 only\n"<<endl;
continue;
}
else
break;
}
//calling the function
hexadecimal_binary(hexa);
break;
case 5:
exit(0);
default:
cout<<"Error: Enter a valid choice\n"<<endl;
}
}
return 0;
}
SCREENSHOT FOR OUTPUT:

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