4. Write the definition of a void function that takes as input two parameters of

Question

4. Write the definition of a void function that takes as input two parameters of type int, say

sum and testScore. The function updates the value of sum by adding the value of

testScore. The new value of sum is reflected in the calling environment. (10)

5. Consider the following program: (20)

#include<iostream>

#include<cmath>

#include<iomanip>

using namespace std;

void traceMe(double x, double y);

int main()

{

double one, two;

cout << "Enter two numbers: ";

cin >> one >> two;

cout << endl;

traceMe(one, two);

traceMe(two, one);

return 0;

}

void traceMe(double x, double y)

{

double z;

if (x != 0)

z = sqrt(y) / x;

else

{

cout << "Enter a nonzero number: ";

cin >> x;

cout << endl;

z = floor(pow(y, x));

}

cout << fixed << showpoint << setprecision(2);

cout << x << ", " << y << ", " << z << endl;

}

The function traceMe in this program outputs the values of x, y, and z. Modify the definition of

this function so that rather than print these values, it sends the values back to the calling environment

and the calling environment prints these values.

Explanation / Answer

4) void function (int& sum, const int& testscore)

{

sum += testscore;

}

5)

#include<iostream>
#include<cmath>
#include<iomanip>
using namespace std;
double traceMe(double& x, double& y);
int main()
{
   double one, two;
   cout << "Enter two numbers: ";
   cin >> one >> two;
   cout << endl;
   double z = traceMe(one, two);
   cout << fixed << showpoint << setprecision(2);
   cout << one << ", " << two << ", " << z << endl;
   z = traceMe(two, one);
   cout << one << ", " << two << ", " << z << endl;
  
   return 0;
}

double traceMe(double& x, const double& y)
{
   double z;
   if (x != 0)
       z = sqrt(y) / x;
   else
   {
       cout << "Enter a nonzero number: ";
       cin >> x;
       cout << endl;
       z = floor(pow(y, x));
   }
   return z;
}

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