I'm I using terminal in ubuntu. I've installed g++ package for compiling c++ programs. But if I try to compile a program, it is giving an error that 'cout is not declared in this scope', even though I've included iostream header file. What should I do??
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Post a small example of what you are doing. – drescherjm Mar 29 '14 at 02:19
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How is iostream included? Is it with the `<>` symbols? – CPlusPlus OOA and D Mar 29 '14 at 02:21
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5Did you do `#include
`? – ikh Mar 29 '14 at 02:21 -
Thank you a lot... it's working by putting std::cout instead of just cout... – Uttam Singapura Mar 29 '14 at 02:36
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2You forgot to read your C++ book. – Lightness Races in Orbit Mar 29 '14 at 02:48
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Read in more detail about namespaces in c++. cout happens to be in the namespace called std.
After declaring your headers you can dousing namespace std; and you don't have to use std::cout every time and use only cout, but that isn't suggested. instead you could declare only what you need.
ex: using std::cout; using std::cin; using std::string; that way you don't have to use std::cout everywhere in your code and use only cout or cin
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Udit Mukherjee
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Maybe you don't have build-essential ? It's mandatory in order to compile correctly on ubuntu.
Ulamspi
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@Ulamspi: If he has installed the `g++` package, then he has `libstdc++` already, as it is a dependency of `g++`; `build-essentials` isn't an additional requirement (although `build-essentials` is nice as it includes other useful tools). It is also not mandatory to have `build-essentials` to compile software with gcc. – Jason C Mar 29 '14 at 02:57