Function/Variable Scope   «Prev

## C++ Function Prototype - Exercise

### Create a function prototype

Objective: Re-code a C program, which uses traditional C function syntax, as a C++ program that uses a proper function prototype. Here is a C program that uses traditional C function syntax:
```/* Compute a table of cubes. */
#include  <stdio.h>
#define  N  15
#define  MAX  3.5

int main(){
int i;
double x, cube();

printf("\n\nINTEGERS\n");
for (i = 1; i <= N; ++i)
printf("cube(%d) = %d\n", i, cube(i));
printf("\n\nREALS\n");
for (x = 1; x <= MAX; x += 0.3)
printf("cube(%f) = %f\n", x, cube(x));
}
```

```double cube(x)
double  x;{
return (x * x * x);
}
```

It gives the wrong answers for the integer arguments, and it does so because integer arguments are passed as if their bit representation were `double`. It is unacceptable as C++ code.

### Instructions

Re-code this program as a C++ program that uses a proper function prototype. Test your program by compiling it using a C++ compiler. C++ compilers enforce type compatibility on function argument values. Therefore, the integer values are properly promoted to `double` values.
Paste the source code of your program below and click the Submit button when you are ready to submit this exercise.