Question

When a segmentation fault occurs, the printf() before it does not execute.

main()
{
 printf( "something" );
 statement;  //this statement causes a segmentation fault
}

In the situation above, why does the printf() not execute?

So do I need to use valgrind in such a case(which prints all printf() before the faulty statement).

Answer 1

An output stream can fail to be output before a program crash but you can force the bytes to be output by flushing them with fflush().

I usually do it with something like this:

if (trace) { fflush(stdout); }