How many function arguments exist in the code?

double FahrenheitToCelsius(double fahrenheit) {
   return (fahrenheit - 32.0) * 5.0 / 9.0;
}
int main() {
   double fahrenheit;
   cin fahrenheit;
   int c1;
   int c2;
   int c3;
   c1 = FahrenheitToCelsius(fahrenheit);
   c2 = FahrenheitToCelsius(32);
   c3 = FahrenheitToCelsius(fahrenheit + 5.0);
}

Question

How many function arguments exist in the code?

double FahrenheitToCelsius(double fahrenheit) {
   return (fahrenheit - 32.0) * 5.0 / 9.0;
} 
int main() {
   double fahrenheit; 
   cin >> fahrenheit;
   int c1;
   int c2;
   int c3;
   c1 = FahrenheitToCelsius(fahrenheit);
   c2 = FahrenheitToCelsius(32);
   c3 = FahrenheitToCelsius(fahrenheit + 5.0);
}

BlackTom AI · Accepted Answer

The function FahrenheitToCelsius is declared with a single parameter, so each call passes one actual argument to it.

Relevant concepts:
- Parameter vs argument: a parameter is the named variable in the function declaration (formal parameter). An argument is the actual value or expression passed to the function when it is called (actual parameter).
- Each function call supplies one argument for each parameter in the call site.

Step-by-step reasoning and counting:
1. Identify all calls to FahrenheitToCelsius in main:
   - c1 = FahrenheitToCelsius(fahrenheit);
   - c2 = FahrenheitToCelsius(32);
   - c3 = FahrenheitToCelsius(fahrenheit + 5.0);
2. For each call, count the arguments inside the parentheses:
   - FahrenheitToCelsius(fahrenheit) → 1 argument (the variable fahrenheit)
   - FahrenheitToCelsius(32) → 1 argument (the literal 32)
   - FahrenheitToCelsius(fahrenheit + 5.0) → 1 argument (the expression fahrenheit + 5.0)
3. Sum the arguments across all calls: 1 + 1 + 1 = 3.

Intermediate detail: The function signature double FahrenheitToCelsius(double fahrenheit) declares one formal parameter. Every call must supply one actual argument to match that single parameter; the code shows three separate calls, therefore three actual arguments appear in the code.

Why the correct answer is correct:
- The question asks for how many function arguments exist in the code (actual arguments passed in calls). There are three calls and each passes exactly one argument, so the total is 3.

Why other options are incorrect:
- Option "4": There are not four calls or four comma-separated arguments in any single call, so 4 is incorrect.
- Option "2": Only two arguments would be correct if there were two calls; there are three calls, so 2 is incorrect.
- Option "1": This would be the count of arguments per call, not the total across the code; the total is three, so 1 is incorrect.

Conclusion: The total number of function arguments in the code is 3, matching the provided answer.

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