Home/ Questions/Ways to resolve the error - c++ requires a type specifier for all declarations.
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Charlie Rodriguez
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Asked: 2022-05-17T14:24:44+00:00 In:

Ways to resolve the error – c++ requires a type specifier for all declarations.

  • 13

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I don’t know what I’m doing wrong, but I’ve already lost a couple of days struggling with this. Here is my command line:

#include <iostream>
 
 using namespace std;
 
 main()
 {
  string password;
  cin >> password;
  if (password == "Lieutenant") {
  cout << "Correct!" << endl;
  } else {
  cout << "Wrong!" << endl;
  }
 
 }

This returns:

||=== Build: Debug in Password (compiler: GNU GCC Compiler) ===| /Users/Administrator/Desktop/AppCreations/C++/Password/Password/main.cpp|5|error: C++ requires a type specifier for all declarations| ||=== Build failed: 1 error(s), 0 warning(s) (0 minute(s), 2 second(s)) ===|.

I don’t have any experience with the “c++ requires a type specifier for all declarations.” In this case, how should I change?

compiler errors
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2 Answers

  1. Best Answer
    Expert

    The cause: 
    You’re missing a string library, and the return type for the main function isn’t given. You’ll receive the same problem if you attempt to assign a variable in a class, because you can initialize variables in a class but not assign them later after variable declaration in C++.

    Solution: You must include the string library, as well as give a return type for your main function. Depending on your implementation, you may be required to define an explicit return statement for main, as follows:

    #include <iostream>
#include <string> //this is the line of code you are missing

using namespace std;

int main()//you also need to provide a return type for your main function
{
string password;
cin >> password;
if (password == "Lieutenant") {
cout << "Correct!" << endl;
} else {
cout << "Wrong!" << endl;
}
return 0;//potentially optional return statement
}
    • 13

  2. It is necessary to declare the return type of main. In legal C++, this should be int In many cases, the return 0; line at the end of your main will be return 0;, i.e. You can exit successfully. Any other 0 can be used to indicate an error condition.

    • 10

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