print octal number in c++

To print an octal number in C++, you can use the std::oct manipulator in combination with the std::cout object. Here are the steps to do it:

1. Include the necessary header files:

#include <iostream>

This includes the iostream header file which provides the necessary input/output stream objects like std::cout.

1. Write the main function:

int main() {
    // Your code here
    return 0;
}

This is the entry point of your program. You can write your code inside the main function.

1. Declare and initialize the octal number:

int octalNumber = 0123; // prefixing with 0 denotes an octal number

In C++, you can represent an octal number by prefixing it with a 0.

1. Print the octal number using std::cout and std::oct:

std::cout << "Octal number: " << std::oct << octalNumber << std::endl;

The std::cout object is used to display output to the console. By default, it treats integers as decimal numbers. However, by using the std::oct manipulator, we can change the output format to octal. The << operator is used to insert the octal number into the output stream. Finally, std::endl is used to insert a newline character and flush the output stream.

1. Run the program: Compile and run the program, and you should see the octal number printed to the console.

Here's the complete code example:

#include <iostream>

int main() {
    int octalNumber = 0123;
    std::cout << "Octal number: " << std::oct << octalNumber << std::endl;
    return 0;
}

When you run this code, it will output:

Octal number: 83

Note that the output is in decimal format because after the std::oct manipulator, std::cout will continue to treat subsequent integers as octal until explicitly changed.