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Just, i don't understand why?

What's wrong with (for integer):

#include <iostream>
int main() {
    int input;
    std::cout << "Enter decimal number: ";
    std::cin >> std::dec >> input;
    std::cout << '\n' << std::oct << input << '\n';
}

At least for the integral part. And about your code:

• Avoid using namespace std, it's a bad practice
• Just main() isn't a valid prototype for the entry point, at least use `int main()
• Define variables in the closest scope possible.
• Try naming variable consistently
• de=de/8; can be simplified to `de /= 8;`

Just, i don't understand why?

What's wrong with (for integer):

#include <iostream>
int main() {
    int input;
    std::cout << "Enter decimal number: ";
    std::cin >> std::dec >> input;
    std::cout << '\n' << std::oct << input << '\n';
}

And about your code:

• Avoid using namespace std, it's a bad practice
• Just main() isn't a valid prototype for the entry point, at least use `int main()
• Define variables in the closest scope possible.
• Try naming variable consistently
• de=de/8; can be simplified to de /= 8;
• floating point conversion is a bit more tricky than just doing what you do

Edit: After testing it (and correcting main() and) : Your code just doesn't work, even for an integer value

Enter decimal no :: (0)10 = (32767.)8
Enter decimal no :: (8)10 = (32776.)8
Enter decimal no :: (10)10 = (32779.)8

Test yourself

Just, i don't understand why?

What's wrong with (for integer):

#include <iostream>
int main() {
    int input;
    std::cout << "Enter decimal number: ";
    std::cin >> std::dec >> input;
    std::cout << '\n' << std::oct << input << '\n';
}

At least for the integral part. And about your code:

• Avoid using namespace std, it's a bad practice
• Define variables in the closest scope possible.
• Try naming variable consistently
• de=de/8; can be simplified to de /= 8;

Just, i don't understand why?

What's wrong with (for integer):

#include <iostream>
int main() {
    int input;
    std::cout << "Enter decimal number: ";
    std::cin >> std::dec >> input;
    std::cout << '\n' << std::oct << input << '\n';
}

At least for the integral part. And about your code:

• Avoid using namespace std, it's a bad practice
• Just main() isn't a valid prototype for the entry point, at least use `int main()
• Define variables in the closest scope possible.
• Try naming variable consistently
• de=de/8; can be simplified to `de /= 8;`

Just, i don't understand why?

What's wrong with:

#include <iostream>
int main() {
    int input;
    std::cout << "Enter decimal number: ";
    std::cin >> std::dec >> input;
    std::cout << '\n' << std::oct << input << '\n';
}

And about your code:

• Avoid using namespace std, it's a bad practice
• de=de/8; can be simplified to de /= 8;

Just, i don't understand why?

What's wrong with (for integer):

#include <iostream>
int main() {
    int input;
    std::cout << "Enter decimal number: ";
    std::cin >> std::dec >> input;
    std::cout << '\n' << std::oct << input << '\n';
}

At least for the integral part. And about your code:

• Avoid using namespace std, it's a bad practice
• Define variables in the closest scope possible.
• Try naming variable consistently
• de=de/8; can be simplified to de /= 8;