CODEWITHSUNDEEP
c++
user1759386
user1759386

Reputation: 13

Syntax error in very simple program

I'm writing my first C++ application. But I get syntax error.

#include <iostream>
using namespace std;

int main() {

    int result = get_num();

    cout << "Result is " << result << endl;

    system("pause");   
    return 0;
}

int get_num(void) { 
    return 1;
}

And compiler said me:

main.cpp(10): error C3861: 'get_num': identifier not found

Upvotes: 1

Views: 134

Answers (5)

sharat
sharat

Reputation: 160

You need to declare or define the function before using it in the main. To declare just add 

 int get_num(void);

at the beginning of your code. If not define the entire function before main like so- Try-

   #include <iostream>
   using namespace std;
    int get_num(void) { 
    return 1;
    }

    int main() {

    int result = get_num();

    cout << "Result is " << result << endl;

    system("pause");   
    return 0;
    }

Upvotes: 1

Rahul Shardha
Rahul Shardha

Reputation: 399

In C++ you need to declare all variables/functions that you want to use before using them. You're using getnum in main but you haven't declared it in the function. Writing int get_num(); outside main will declare this at a global scope. i.e. any function in that file would be able to use it. declaring get_num(); inside a function will enable you to use this function only inside that particular function.

Upvotes: 1

taocp
taocp

Reputation: 23664

Two options:

1) declare a prototype of get_num before main:

int get_num(void);
int main() {
}

2) move your definition of get_num before main.

Upvotes: 4

Igor Ševo
Igor Ševo

Reputation: 5525

Write int get_num(void); above the main() function.

C++ requires variables and functions to be declared above the current scope.

Upvotes: 2

Shafik Yaghmour
Shafik Yaghmour

Reputation: 158619

One solution would be to add a forward declaration before main like so:

int get_num(void) ;

the other solution would be to put the definition of get_num before main and then you would not need a forward declaration.

Upvotes: 2

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