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what the main function in this program returns to os?


what the main function in this program returns to os?

By : chuckalbatross
Date : September 23 2020, 07:00 PM
this one helps. A convention has grown up to return 0 for success and non-zero otherwise: The C standard doesn't require you to define success or any specific return value.
Also, some shells only consider the int from main to be an 8 bit value, so you might want to restrict your possibilities to the range [-127, +127], although that scheme is falling away.
code :


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Cannot determine why function of a program returns an array to the main program

Cannot determine why function of a program returns an array to the main program


By : deden indra setiawan
Date : March 29 2020, 07:55 AM
I wish this helpful for you Functions in C use pass by value for paramenters. When you pass s3 as the first argument of concat, you are passing the value, 'address of the array s3'. The function concat uses the address as the location of the argument you named result. The function copies values into the memory location result (which is another name for s3 in the calling function).
When the function reaches the end of the function concat, the array at s3 has been modified.
code :
printf("s3 address: %x\n",s3);
printf("result address: %x\n",result);
scala main returns unit. How to set program's return value

scala main returns unit. How to set program's return value


By : motom
Date : March 29 2020, 07:55 AM
it fixes the issue Yes, you exit with a code different than zero by calling either java.lang.System.exit(n) or better sys.exit(n) (which is Scala's equivalent).
If you mix in App in your main application object, you do not define method main but can just write its contents in the object's body directly.
code :
object Test extends App {
  val a0 = args.headOption.getOrElse {
    Console.err.println("Need an argument")
    sys.exit(1)
  }
  println("Yo " + a0)
  // implicit: sys.exit(0)
}
Program returns to its main point unexpectedly at Pic C in MPlab

Program returns to its main point unexpectedly at Pic C in MPlab


By : Amine Ladraa
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , If the program counter jumps back to 0 unexpectedly, the PIC is resetting. There are many causes of reset, depending on the PIC. A common one is watchdog timeout, and you don't seem to be kicking the watchdog, so have you disabled it in the config bits? Status register bit 4 will tell you if a watchdog timeout occurred.
Why is the program not running the main function of a flex and bison compiled C program

Why is the program not running the main function of a flex and bison compiled C program


By : EvgenyMalkov
Date : March 29 2020, 07:55 AM
this will help I've written a bison parser using flex and c. The parser is compiled without error, but when I run the executable file the main function is not executed (It doesn't print out the first line after the main declaration that is actually a print instruction) , This is wrong:
code :
gcc c_def.tab.h lex.yy.c -o c2p -lfl
%option noyywrap
How can a program with a global variable called main instead of a main function work?

How can a program with a global variable called main instead of a main function work?


By : Andrés Lamarca
Date : March 29 2020, 07:55 AM
will be helpful for those in need Before going into the meat of the question about what is going on, it is important to point out that program is ill-formed as per defect report 1886: Language linkage for main():
code :
error: cannot declare '::main' to be a global variable
int main = ( std::cout << "C++ is excellent!\n", 195 ); 
    ^
declarator  
|        initializer----------------------------------
|        |                                           |
v        v                                           v
int main = ( std::cout << "C++ is excellent!\n", 195 ); 
    ^      ^                                   ^
    |      |                                   |
    |      |                                   comma operator
    |      primary expression
global variable of type int
main:
.zero   4
movl    $195, main(%rip)
const int main = 195 ;
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