### C++ Program to Convert Decimal to Binary, Octal and Hexadecimal

```#include <iostream>
#include <iterator>
#include <algorithm>
#include <bitset>//For binary conversion

//Function with converts the number to octal number
std::string toOctal(int num) {
std::string octalNum("");
while(num > 0) {
int total = num % 8;
num /= 8;
octalNum.append(std::to_string(total));
}
std::reverse(octalNum.begin(),octalNum.end());
return (std::move(octalNum));
}

//Function with converts the number to Binary number
std::string toBinary(int num) {
return std::move((std::bitset<8>(num).to_string()));
}

//Function with converts the number to Hexadecimal number
std::string toHex(int num) {
std::string hexNumber("");
while(num > 0) {
int rem = num % 16;
if(rem > 9){
switch(rem) {
case 10: hexNumber.append("A");break;
case 11: hexNumber.append("B");break;
case 12: hexNumber.append("C");break;
case 13: hexNumber.append("D");break;
case 14: hexNumber.append("E");break;
case 15: hexNumber.append("F");break;
}
}
else
hexNumber.append(std::to_string(rem));
num /= 16;
}
//Reversing the the string
std::reverse(hexNumber.begin(),hexNumber.end());
return(std::move(hexNumber));

}

std::string conversion(int num) {
std::string result("\n\nDecimal: ");
result.append(std::to_string(num));
result.append("\n");

//Converting to Binary
result.append("Binary: ");
result.append(toBinary(num));
result.append("\n");

//Converting to Octal
result.append("Octal: ");
result.append(toOctal(num));
result.append("\n");

//Converting to hex
result.append("Hex: ");
result.append(toHex(num));
result.append("\n");
return (std::move(result));
}

int main() {
std::cout << "Enter Number: ";

std::transform(std::istream_iterator<int>(std::cin),std::istream_iterator<int>(),
std::ostream_iterator<std::string>(std::cout,"\nNumber:"),conversion);
}
```

`OUTPUT:`

`Enter Number: 332`
```Decimal: 332
Binary: 0000000101001100
Octal: 514
Hex: 14C

Number:1234

Decimal: 1234
Binary: 0000010011010010
Octal: 2322
Hex: 4D2```

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