Help with IDE

[shotgun]

Hi guys,

I am scratching c++ and I am a little bit confused.

In Eclipse (galileo 3.5) if I do this:

##############################################
//hello.cpp
#include <iostream>

int main(){
std::cout <<"Hello, World!\n";
return 0;
}
##############################################

It complains, but If I do this:

##############################################
#include <iostream>
using namespace std;

int main() {
cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!!
return 0;
}
##############################################

Eclipse is happy.

I do not understand why. It is the same thing, or am I wrong?
What is the difference?

Also, all the tutorials I can find use these two interchangeably.

Should I do this -> std::cout <<"Hello, World!\n"; ???
or this -> cout << "!!!Hello World!!!" << endl;

Thank You

Danny

[shacktar]

It complains

What are the exact error(s) you're receiving?

[Intrexa]

It is the same, the top one compiles fine for me, are you sure you copied it over exactly as you have it in your post?

[anonymous23323124]

There is a subtle difference between '\n' and std::endl, but it often will have no effect. It certainly won't cause a compiler error. See here for details:
http://www.cplusplus.com/forum/beginner/7350/
So basically, do whichever you prefer :)

And as previous members have said, each code should work if and only if the other does. What is the compiler error you are getting.

[shotgun]

Hi guys,

Here is the output:

####################################
**** Build of configuration Debug for project test3 ****

make all
Building file: ../test2.cpp
Invoking: GCC C++ Compiler
g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"test2.d" -MT"test2.d" -o"test2.o" "../test2.cpp"
Finished building: ../test2.cpp

Building target: test3
Invoking: GCC C++ Linker
g++ -o"test3" ./test2.o
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 0 has invalid symbol index 12
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 1 has invalid symbol index 13
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 2 has invalid symbol index 2
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 3 has invalid symbol index 2
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 4 has invalid symbol index 12
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 5 has invalid symbol index 14
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 6 has invalid symbol index 14
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 7 has invalid symbol index 14
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 8 has invalid symbol index 2
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 9 has invalid symbol index 2
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 10 has invalid symbol index 13
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 11 has invalid symbol index 14
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 12 has invalid symbol index 14
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 13 has invalid symbol index 14
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 14 has invalid symbol index 14
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 15 has invalid symbol index 14
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 16 has invalid symbol index 14
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 17 has invalid symbol index 14
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 18 has invalid symbol index 14
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 19 has invalid symbol index 14
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 20 has invalid symbol index 14
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 21 has invalid symbol index 14
/usr/bin/ld: /usr/lib/debug/usr/lib/crt1.o(.debug_info): relocation 22 has invalid symbol index 22
/usr/lib/gcc/i486-linux-gnu/4.4.5/../../../../lib/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status
make: *** [test3] Error 1
############################################

Hope it helps

Thank You

Danny