Member Avatar for Donnovan

Hi, I'm using Microsoft Visual C++ and I keep getting this error referring to this one line in my main file . can someone HELP ME ?

#include <iostream>

using namespace std;
int main()
{
	float tempFahrenheit;
	float tempCelsius;
	float Omrekenen;

	cout << "Geef de temperatuur in Fahrenheit: ";
	cin >> tempFahrenheit;
	tempCelsius =Omrekenen(tempFahrenheit);
	cout << "\n Dit is de temperatuur in Celsius: ";
	cout << tempCelsius << endl;
	return 0;
}
float Omrekenen(float tempFahrenheit)
{
	float tempCelsius;
	tempCelsius = (tempFahrenheit - 32)*5/9;
	return tempCelsius;
}
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Generated

The MSVC error C2064 ("term does not evaluate to a function taking 1 arguments") means the compiler saw an identifier at a call site that it could not treat as a callable with the indicated parameter list. In this thread the call was resolved to a non-callable symbol (a local float) that hid the intended function. As noted, a forward declaration (prototype) moves the function's type into scope before use; as demonstrated, giving the function and the variable different names also resolves the conflict. confirmed the issue was fixed (Omrekenen = "convert").

A compact illustration of the common mistake and two safe fixes:

Problem (name collision hides function)

int incr(int x) { return x + 1; }

int main() {
    int incr = 5;      // hides the function name
    int r = incr(2);   // error: 'incr' is not callable
}

Fix A — don't reuse the same name (rename the variable)

int incr(int x) { return x + 1; }

int main() {
    int value = 5;
    int r = incr(2);   // OK
}

Fix B — if the intent is to hold a callable, use a function pointer or std::function

int incr(int x) { return x + 1; }

int main() {
    int (*fn)(int) = incr;
    int r = fn(2);     // OK
}

Quick troubleshooting checklist

  • Look for a local/global variable with the same identifier as the function; rename or remove it.
  • Ensure a function prototype or the function definition appears before its use.
  • Verify the call's argument count and types match the function's signature. A mismatched signature can produce the same or a related error.
  • If storing a callable in a variable, declare the correct function-pointer or std::function type (or use a lambda).

These steps explain why the original call failed and offer alternatives that avoid shadowing or declaration-order problems.

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All 5 Replies

Member Avatar for Narue

Just like variables, functions have to be declared before you use them:

#include <iostream>

using namespace std;

float Omrekenen(float tempFahrenheit);

int main()
{
	float tempFahrenheit;
	float tempCelsius;
	float Omrekenen;

	cout << "Geef de temperatuur in Fahrenheit: ";
	cin >> tempFahrenheit;
	tempCelsius =Omrekenen(tempFahrenheit);
	cout << "\n Dit is de temperatuur in Celsius: ";
	cout << tempCelsius << endl;
	return 0;
}
float Omrekenen(float tempFahrenheit)
{
	float tempCelsius;
	tempCelsius = (tempFahrenheit - 32)*5/9;
	return tempCelsius;
}
Member Avatar for Donnovan

im still having problems, with the code after declaring the function, same error massege

Member Avatar for n.aggel

im still having problems, with the code after declaring the function, same error massege

I don't know in what language you are writing, but the reason the compiler complained is that you used the word Omrekenen{what does it mean by the way?} as a function name and as a float...

i changed your code to::

#include <iostream>

using namespace std;

float Omrekenen_func(float tempFahrenheit);

int main()
{
	float tempFahrenheit;
	float tempCelsius;
	float Omrekenen;

	cout << "Geef de temperatuur in Fahrenheit: ";
	cin >> tempFahrenheit;
	tempCelsius =Omrekenen_func(tempFahrenheit);
	cout << "\n Dit is de temperatuur in Celsius: ";
	cout << tempCelsius << endl;
	return 0;
}

float Omrekenen_func(float tempFahrenheit)
{
	float tempCelsius;
	tempCelsius = (tempFahrenheit - 32)*5/9;
	return tempCelsius;
}

and everything compiled fine!

Member Avatar for n.aggel

PS:: if this solves your problem, plz mark it the thread as solved!

Member Avatar for Donnovan

omreken means to convert, im writing in dutch language .
and de code is working now thank you .

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