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Old 08-01-2004, 06:25 AM   #1
Registered: Apr 2004
Posts: 682

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[C++] -Wall Output

I have written a very simple C++ program [1] and used "g++ -Wall -pedantic -o kay kay.cpp" to compile it.

The -Wall and -pedantic gives me a bunch of library errors which all looks Hebrew to me. I was wondering what man page or document to read to decipher the meaning.

Thanks for any kind of help.

[1] 1 #include <iostream>
3 using namespace std;
5 int main (void) {
7 int answer, product;
8 product = 123*456;
9 while(1) {
10 cout << "Enter number" <<endl;
11 cin >> answer;
12 if (answer == product)
13 break;
14 cout << "wrong"<<endl;
15 }
16 cout << "well done"<<endl;
17 }
Old 08-01-2004, 06:55 AM   #2
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Registered: Aug 2002
Location: Groningen, The Netherlands
Distribution: Debian
Posts: 2,536

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Hmm, I copy-pasted your code. Then I removed the line-numbers, and compiled-linked it with your command: "g++ -Wall -pedantic -o kay kay.cpp".

Not a single warning, nor any error! Though I expected at least one for a missing "return 0;" at the end of main().
Or did you actually have the line numbers included? If so, C(++) sources, should not contain line numbers. Or you should comment them of course...

Try this (cleaned up) version of your code:
#include <iostream>

using namespace std;

int main (void) {

	int answer, product;
	product = 123*456;
	while(1) {
		cout << "Enter number" <<endl;
		cin >> answer;
		if (answer == product)
		cout << "wrong"<<endl;
	cout << "well done"<<endl;
	return 0;

Last edited by Hko; 08-01-2004 at 06:59 AM.
Old 08-01-2004, 08:17 AM   #3
Registered: Apr 2004
Posts: 682

Original Poster
Rep: Reputation: Disabled
Thanks for your quick reply. The line-numbers were given intentionally using cat and I never compiled w/ line-numbers. I compiled again & everything came out clean.

Anyhow, sometimes we have errors when we compile w/ -Wall and -pedantic - errors which are not visible in normal -o compilations. Myquestions is how to know more about those errors. Most of the time they are link library related errors. How can we decipher the meaning of those errors? gdb? ddd? or anything else?



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