Below are shown a number of variable and constant declarations/initialisations. There are some bugs (errors) in the code. Identify the bugs and fix them.
#include <iostream>
int main ()
{
int a;
floaty;
int z;
long int p = 1000;
const max = 100;
const float e;
char c
short z;
return 0;
}
Without writing any C++ code, decide what you think the results of the following expressions would be in C++. After you have finished, test your answers by writing a program that computes and prints out the answers. Remember that in C++ expressions involving only integers are computed using integer arithmetic.
The following program is intended to read a distance in miles from the user and display its equivalent in km. However, the program does not currently work correctly. Compile and run the program and then debug it so that it performs the conversion correctly.
# include <iostream>
int main ()
{
// program to convert distances between miles and km
float km, miles, km_in_miles ;
// read distance in miles
std::cout << "Enter distance in miles: ";
std::cin >> miles ;
// convert to km
km_in_miles = (5/8); // one km in units of miles
km = miles / km_in_miles;
// display in km
std::cout << " This equates to " << km << " km\n";
return 0;
}
Write a C++ program which evaluates the result and remainder of the expression (2 + 3 ∗ 3)/n, where n is an integer number entered by the user. The program should use integer arithmetic to compute the result and should print out both the result and the remainder.
Now modify the program you wrote in Exercise 4 to use floating point arithmetic instead. Since the remainder operator is not defined for floating point arithmetic, this time only the result of the expression should be printed.
Create a C++ project containing the following code:
#include <iostream>
int main ()
{
int x=5, y=10;
// ADD CODE HERE
return 0;
}
Now replace the comment line with single statements to perform the following tasks:
Which of the following C++ programs will lead to compilation errors?
Verify your answers by entering the code into a .cpp file and compiling.
#include <iostream>
int main ()
{
int a = 0;
float b = 4;
int c = b / a;
std::cout << " c = " << c << "\n";
return 0;
}
#include <iostream>
#include <cmath>
int main ()
{
int a = -2;
float b = 4;
int c = b / std::abs (a);
std::cout << " c = " << c << "\n";
return 0;
}
#include <iostream>
int main ()
{
int a = 2;
float b = 4;
int c = b % a ;
std::cout << " c = " << c << "\n";
return 0;
}
Write a C++ program to read in an integer value from the user (from the terminal or as a command-line argument) and compute and display the square root of its absolute value.
Write a C++ program which takes three command-line arguments, corresponding to floating point numbers x, y, z, and then calculates and prints out the result of evaluating:
\[x^{y^z}\]Write a C++ program taking a single command-line argument, corresponding to an integer number i, and then use floating point arithmetic to compute the value of the following expression:
\[((i + 3) \times (i + 2) \times (i + 1) \times i)^3\]Below is a code listing for a C++ program which is intended to compute the roots of a quadratic equation of the form:
\[ax^2 + bx + c = 0\]The formula for solving for x is:
\[x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\]The following program currently does not compile. Modify it so that it compiles correctly, then test it and remove any further bugs in the code if required.
#include <iostream>
int main ()
{
// compute roots of quadratic equation of form ax^2 + bx + c = 0
// declare variables for coefficients and roots
float a, b, c, r1, r2;
// read values of coefficients from user
std::cout << "Enter a b c: ";
std::cin >> a >> b << c;
// compute roots
r1 = -b + std::sqrt (b*b - 4.0*a*c) / (2.0*a);
r2 = -b - std::sqrt (b*b - 4.0*a*c) / (2.0*a);
// display answers
std::cout << "Roots = " << r1 << ", " << r2 << "\n";
return 0;
}
Write a program to read in three floating point values from the user (a, b and c), which represent the lengths of three sides of a triangle. The program should then compute the area of the triangle according to the equation:
\[A = s (s − a) (s − b) (s − c)\]where s is half of the sum of the three sides.
Write a program to accept a single command-line argument, corresponding to a floating point number representing a radius r, and then compute the surface area S and volume V of a sphere of that radius, according to the following equations:
\[S = 4\pi r^2\] \[V = \pi r^3\]You can either define your own constant for π, or use the M_PI constant defined
in the cmath library.