explain for syntax used by clion for c++

Question

e.g: for hello:
#include <iostream>
int main(){
std:: cout <<"hello"<<std::endl;
return 0;
}
l am confused with ds syntax diff from what l learnt

Answer 1

On the top is #include - include libraries.
The most important thing is function called main() of type int. It's 'commands' is closed in brackets {}. There is program starts. If everything worked fine then it return 0.

Answer 2

ok bt if common syntax to print hello it gives error...This is where my problem is

Answer 3

In c++ there are 2 top ideas to print something.

The first one std: :cout and it looks like you wrote. The second one is printf and it looks like:
printf("I'm writing %d\n", int(5));

You have to know %- in the second idea. Different % for different type of variable.

Answer 4

ok thank you

Answer 5

Maybe you should do

#include <iostream>
using namespace std;

int main(){
cout <<"hello"<<endl;
return 0;
}

Answer 6

using namespace std when there are just 2 times you call something from namespace std? No need for using namespace std here.