function should have a prototype

[sicba2222]

Hi all,

I am new to C++...I tried to compile the following program...

#include<iostre am.h>
#include<conio. h>
#include<string >
#include<stdio. h>

int main() {
String mystr;
cout << "What is your name?";
getline(cin,mys tr);
cout << "my name is:" << mystr;
cout << "What is your favourite team?";
getline(cin, mystr);
cout << "My favourite team is " << mystr;
getch();
return 0;
}

but i am getting the error 'function getline should have a prototype'...I am getting other errors as well apart from this ...but i think if i can add the relevant "#include.. ." i can fix this error..can anyone please tell me what is it for 'getline' function...thnk in advnce...

[Savage]

Hi all,

I am new to C++...I tried to compile the following program...

#include<iostre am.h>
#include<conio. h>
#include<string >
#include<stdio. h>

int main() {
String mystr;
cout << "What is your name?";
getline(cin,mys tr);
cout << "my name is:" << mystr;
cout << "What is your favourite team?";
getline(cin, mystr);
cout << "My favourite team is " << mystr;
getch();
return 0;
}

but i am getting the error 'function getline should have a prototype'...I am getting other errors as well apart from this ...but i think if i can add the relevant "#include.. ." i can fix this error..can anyone please tell me what is it for 'getline' function...thnk in advnce...

It's namespace that you are missing.You can use std::getline or add this line after includes:

using namespace std;

PS:Please use [code=cpp] tags around your c++ code

Savage

[keerthiramanarayan]

Hi all,

I am new to C++...I tried to compile the following program...

#include<iostre am.h>
#include<conio. h>
#include<string >
#include<stdio. h>

int main() {
String mystr;
cout << "What is your name?";
getline(cin,mys tr);
cout << "my name is:" << mystr;
cout << "What is your favourite team?";
getline(cin, mystr);
cout << "My favourite team is " << mystr;
getch();
return 0;
}

but i am getting the error 'function getline should have a prototype'...I am getting other errors as well apart from this ...but i think if i can add the relevant "#include.. ." i can fix this error..can anyone please tell me what is it for 'getline' function...thnk in advnce...

I would like to add to the above reply. You should refrain from using the .h when including standard c++ libraries. So preferably use

#include <iostream>
 

instead of

#include<iostream.h>
 

.

You have used the notation for string but have not done so in the case of iostream.

[Andr3w]

Well even if he didn't use the namespace he could easily do:

// instead of
cout >> "something"
 
// he could write
std::cout >> "something else"
 

That's for all namespaces in C++, either you include them and you don't use the global operator if you want to use a function of a property that's in them or you use the using operator the namespace's name and add global operator and the function or property that's declared in it.

generally it's

using namespace namsepace_name;
 

Becareful tho if you include namespaces that have functions with the same name ;)

[manjuks]

Look at String mystr; That declaration should be string mystr; all letters in small letters.

[keerthiramanarayan]

I repaired the code to this and it works fine. (on VC and gcc atleast). This avoids the name clash problem as pointed out above. The

using std::cout;
 

also makes sure that you don't go around typing std:: each time you use the function/class

#include <iostream>
#include <string>
 
using std::string;
using std::cin;
using std::cout;
 
int main() {
    string mystr;
    cout << "What is your name?";
    getline(cin,mystr);
    cout << "my name is:" << mystr;
    cout << "What is your favourite team?";
    getline(cin, mystr);
    cout << "My favourite team is " << mystr;
    return 0;
}
 

Regards,
Keerthi Ramanarayan

[manjuks]

I repaired the code to this and it works fine. (on VC and gcc atleast). This avoids the name clash problem as pointed out above. The

using std::cout;
 

also makes sure that you don't go around typing std:: each time you use the function/class

#include <iostream>
#include <string>
 
using std::string;
using std::cin;
using std::cout;
 
int main() {
    string mystr;
    cout << "What is your name?";
    getline(cin,mystr);
    cout << "my name is:" << mystr;
    cout << "What is your favourite team?";
    getline(cin, mystr);
    cout << "My favourite team is " << mystr;
    return 0;
}
 

Regards,
Keerthi Ramanarayan

Hi keerthi,

why you have used
(code : cpp)
using std::string;
using std::cin;
using std::cout;

Instead you can use
(code : cpp)
using namespace std;

[Savage]

Hi keerthi,

why you have used
(code : cpp)
using std::string;
using std::cin;
using std::cout;

Instead you can use
(code : cpp)
using namespace std;

No need to use whole namespace,when you can use just parts of it.This makes *.obj and .exe files smaller.

Savage

[oler1s]

No need to use whole namespace,when you can use just parts of it.This makes *.obj and .exe files smaller.

Uhh...what? I'm going to assume this was said in a muddled state of mind, as this is most certainly a wrong thing to say.

[Savage]

Uhh...what? I'm going to assume this was said in a muddled state of mind, as this is most certainly a wrong thing to say.

Ooops.......... sorry for that.

OP,when said using std::cout(e.g) you can now just use cout without std prefix,while others you must still prefix with std.

Only two good reasons for doing this is evading possible name conflicts.What if there is (for e.g) variable x inside std(there is no variable x inside std just a example) and you put :

using namespace std;

and declare a variable(or function) called x,there will be name conflict.But with using just some things from the namespace you can possible avoid these conflicts.