Question

What are the errors in the following code?

My professor gave us this prewritten code and asked us to find the errors in it so that it can run properly

#include <cstdlib>
#include <ctime>
#include <iostream>
using namespace std;

// input: integer
// output: none
// adds five to the given parameter
void addFive( int x ) {
    x += 5;
}

// input: none
// output: a random number
int generateRandomNumber() {
    srand( time(0) );
    return rand() % 100;
}

// input: three integers
// output: the sum of all three parameters
int sum( int x, int y, int z ) {
    return x + x + x;
}

// input: two doubles
// output: the product of the two doubles
double multiply( double a, double b );

int main() {
    cout << "Welcome to Function World" << endl;

// SECTION I: update comment below on how you fixed this section's code, and tests run
// that show function is working properly
// FIX =
// TESTS:

    cout << endl;
    cout << "******************" << endl;
    cout << "Section I" << endl;
    cout << "******************" << endl;

    int numTrees = 4;
    cout << "There are initially " << numTrees << " trees." << endl;
    addFive( numTrees );
    cout << "We planted five trees, there are now " << numTrees << " trees." << endl;

// SECTION II: update comment below on how you fixed this section's code, and tests run
// that show function is working properly
// FIX =
// TESTS:

    cout << endl;
    cout << "******************" << endl;
    cout << "Section II" << endl;
    cout << "******************" << endl;

    printSmileyFace();

// SECTION III: update comment below on how you fixed this section's code, and tests run
// that show function is working properly
// FIX =
// TESTS:

    cout << endl;
    cout << "******************" << endl;
    cout << "Section III" << endl;
    cout << "******************" << endl;

    cout << "Five different random numbers are: " << endl;
    for( int i = 0; i < 5; i++ ) {
        cout << "\t" << generateRandomNumber() << endl;
    }


// SECTION IV: update comment below on how you fixed this section's code, and tests run
// that show function is working properly
// FIX =
// TESTS:

    cout << endl;
    cout << "******************" << endl;
    cout << "Section IV" << endl;
    cout << "******************" << endl;

    int num1, num2, num3;
    cout << "Enter three numbers: ";
    cin >> num1 >> num2 >> num3;
    cout << "The sum of all three is " << sum( num1, num2 ) << endl;

// SECTION V: update comment below on how you fixed this section's code, and tests run
// that show function is working properly
// FIX =
// TESTS:

    cout << endl;
    cout << "******************" << endl;
    cout << "Section V" << endl;
    cout << "******************" << endl;

    cout << "Another random number is " << generateRandomNumber << endl;

// SECTION VI: update comment below on how you fixed this section's code, and tests run
// that show function is working properly
// FIX =
// TESTS:

    cout << endl;
    cout << "******************" << endl;
    cout << "Section VI" << endl;
    cout << "******************" << endl;

    double doub1, doub2;
    cout << "Enter two doubles: ";
    cin >> doub1 >> doub2;
    cout << "Their product is: " << multiply( doub1, doub2 ) << endl;

    cout << endl;
    cout << "******************" << endl;
    cout << "Section Done" << endl;
    cout << "******************" << endl;

    cout << endl << "Congrats!  You fixed them all (hopefully correctly!)" << endl << endl << "Goodbye" << endl << endl;

    return 0;
}

Answer 1

MODIFIED CODE :

#include <cstdlib>
#include <ctime>
#include <iostream>
using namespace std;

// input: integer
// output: none
// adds five to the given parameter
int addFive( int x ) {
    x += 5;
    return x;//returning the updated value so return type is int
}

void printSmileyFace()
{
   int s=1;
   char ch=s;//smiley value stored in ch
   cout<<ch<<endl;
}
// input: none
// output: a random number
int generateRandomNumber() {
    return rand() % 100;// i have deleted one row which is in your code.Because it stoping the generating 5 diiferent random numbers
}

// input: three integers
// output: the sum of all three parameters
int sum( int x, int y, int z ) {
    return x + y + z;//adding x and y and z and returing the value
}

// input: two doubles
// output: the product of the two doubles
double multiply( double a, double b )// i have writed the double method which gives multiplication of two numbers
{
   return a*b;
}

int main() {
   int temp_rand;
    cout << "Welcome to Function World" << endl;

// SECTION I: update comment below on how you fixed this section's code, and tests run
// that show function is working properly
// FIX =
// TESTS:

    cout << endl;
    cout << "******************" << endl;
    cout << "Section I" << endl;
    cout << "******************" << endl;

    int numTrees = 4;
    cout << "There are initially " << numTrees << " trees." << endl;
    numTrees=addFive( numTrees );//i have stored the updated value in numTrees
    cout << "We planted five trees, there are now " << numTrees << " trees." << endl;

// SECTION II: update comment below on how you fixed this section's code, and tests run
// that show function is working properly
// FIX =
// TESTS:

    cout << endl;
    cout << "******************" << endl;
    cout << "Section II" << endl;
    cout << "******************" << endl;

    printSmileyFace();

// SECTION III: update comment below on how you fixed this section's code, and tests run
// that show function is working properly
// FIX =
// TESTS:

    cout << endl;
    cout << "******************" << endl;
    cout << "Section III" << endl;
    cout << "******************" << endl;

    cout << "Five different random numbers are: " << endl;
    for( int i = 0; i < 5; i++ ) {
       temp_rand=generateRandomNumber();
        cout << "\t" <<temp_rand<< endl;
    }

// SECTION IV: update comment below on how you fixed this section's code, and tests run
// that show function is working properly
// FIX =
// TESTS:

    cout << endl;
    cout << "******************" << endl;
    cout << "Section IV" << endl;
    cout << "******************" << endl;

    int num1, num2, num3;
    cout << "Enter three numbers: ";
    cin >> num1 >> num2 >> num3;
    cout << "The sum of all three is " << sum( num1, num2,num3) << endl;

// SECTION V: update comment below on how you fixed this section's code, and tests run
// that show function is working properly
// FIX =
// TESTS:

    cout << endl;
    cout << "******************" << endl;
    cout << "Section V" << endl;
    cout << "******************" << endl;

    cout << "Another random number is " << generateRandomNumber()<< endl;

// SECTION VI: update comment below on how you fixed this section's code, and tests run
// that show function is working properly
// FIX =
// TESTS:

    cout << endl;
    cout << "******************" << endl;
    cout << "Section VI" << endl;
    cout << "******************" << endl;

    double doub1, doub2;
    cout << "Enter two doubles: ";
    cin >> doub1 >> doub2;
    cout << "Their product is: " << multiply( doub1, doub2 ) << endl;

    cout << endl;
    cout << "******************" << endl;
    cout << "Section Done" << endl;
    cout << "******************" << endl;

    cout << endl << "Congrats! You fixed them all (hopefully correctly!)" << endl << endl << "Goodbye" << endl << endl;

    return 0;
}

OUTPUT :