Dev C++ Cout Was Not Declared In This Scope

Posted By admin On 06.05.20

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  1. Not Declared In This Scope
  2. Dev C++ Cout Was Not Declared In This Scope Mean

Can you please help me and tell me what I am doing wrong? I have been looking at the program for two hours and need help. I keep getting this error: 'triangle' was not declared in this scope. Also, that is the only error, so I don't have anymore. #include using namespace std.

ExpertMod5K+
You should only really call a function like .c_str if you need to call a legacy C function. In this case atoi is a legacy C function but C++ has plenty of better options that you could use (actually the legacy C standard library has better options to use other than atoi). In a good C++ design you should be avoiding dropping down to C constructs like arrays if at all possible favouring vector<> or array<> instead.
This can be implemented entirely using the C++ library using a stringstream which has the advantage that you cen tell how much of the string has been converted.
  1. #include<iostream>
  2. #include<string>
  3. #include<sstream>
  4. using namespace std;
  5. int main()
  6. {
  7. string str = '131.90';
  8. string leftover;
  9. istringstream iss;
  10. int result;
  11. iss.str(str);
  12. iss >> result;
  13. iss >> leftover;
  14. cout << 'Converted: ' << result << ' Leftover: ' << leftover << endl;
  15. }
Output: Converted: 131 Leftover: .90
By simply changing the type of result to double I can convert the whole string.

Hi guys,
I have a code in C++ that was written way back in 1995.Back then,I guess even in C++,#include<iostream.h> was used unlike nowadays, #include<iostream> using namespace std;...im rite now trying to compile that code with a g++ compiler.It gives the error at lots of places:'cout not declared in this scope'..I have tried using namespace std...but if I use that then errors sprout up in files that belong to C++ standard library...so I haven't been able to use using namespace std;....i have even tried using std::cout<<...<<std::endl...but even that is not working.....any ideas to get past this problem are appreciated.

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Not Declared In This Scope

Not

Thanks....

Dev c++ cout was not declared in this scope
  1. Dec 07, 2015  Hello everyone. This is my first time posting and I have a problem that I hope that you can help me out with. I am a teacher who is trying to use the Arduino.
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  3. C: Variable Scope and 'This' 'Scope' is a concept which can be applied to many things in C, and generally refers to the region of code in which something is accessible. In the case of variables, variables are only accessible after they've been declared in the code.
  4. The cstdlib header contains the definition for the exit function as csurfer said, however up until recently this header was generally included by dependency - often unnecessarily.
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Ancient Dragon5,243

post one of the files that has the errors, especially the top of the *.cpp file where you have all the includes etc. The problem is most likely missing something like this:

or this

or like this:

Dev C++ Cout Was Not Declared In This Scope Mean

Edited by Ancient Dragon: n/a