How to Force Output Flushing in C ?

Force Flushing Output to the Screen in C

In C , when using the std::cout stream, output is buffered, meaning it is not necessarily sent to the screen immediately. This can be problematic if you want to display intermediate results or status updates during a long-running process.

To force the std::cout buffer to be flushed, you can simply insert std::flush after your output statement. For example:

<code class="cpp">std::cout << "Beginning computations..." << std::flush;
computations();
std::cout << " done!\n";</code>

This will ensure that "Beginning computations..." is printed to the screen immediately, even before the computations() function is called.

Another option is to use the std::endl manipulator, which automatically flushes the buffer after printing a newline:

<code class="cpp">std::cout << "Beginning computations..." << std::endl;
computations();
std::cout << " done!";</code>

By using one of these techniques, you can control the timing of your output and ensure that important messages are displayed at the appropriate time.

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