CS 111 Lab 9
1. Consider the following C++ program. What is the output from the program in
response to the following user inputs?
#include <iostream>
using namespace std;
int main () {
int n;
cout << "Please give me an integer: ";
cin >> n;
if (n < 10) {
cout << "Integer is too small." << endl;
if (n < 0) return 0;
}
if (n % 2 == 0) cout << 3 * n / 2 << endl;
else if (n % 4 == 1) cout << 3 * ((n - 1) / 4) + 1;
else cout << 3 * ((n + 1) / 4) - 1;
cout << endl;
return 0;
}
(a) The user enters: -9
(b) The user enters: 9
(c) The user enters: 10
(d) The user enters: 11
(e) The user enters: 21
2. The following C++ program is supposed to ask a user to enter three different
integers. It then prints the middle value of the three input numbers. (For example,
if the user types 10 5 15, the program should print 10.) The program has several
errors. Rewrite the program to fix the errors and arrange the program so that it is
easier for a human to read.
# <iostream>;
using namespace std;
int main
{
int x, y, z;
cout << "Enter three different integers: " endl;
cin >> "x" >> "y" >> "z" endl;
if ((x > y > z) && (z > y > x)); cout << y;
if ((y > x > z) && (z > x > y)); cout << x;
if ((z > y > x) && (x > y > z)); cout << y; return; };

3. Write a function multiPrint(int n, char c) that prints a n copies of a character c.
Apply this function to print an upright triangle that may look like the image
below:
c
c c
c c c
c c c c

4. Write a function add3 which calculates the sum of three integer numbers.

You should at least try them before, then if you need help with a specific question, ask it here.
You'll end up not understanding anything and it will screw you over big time during your whole semester.



Anyways, if you don't want to follow my advice, here are the answers:





1. a. return 0 (end the program, no output)
b. Integer is too small
c. 15
d. 10
e. 16

2.

#include "stdafx.h"
#include <iostream> // old - # <iostream>;
using namespace std;
int main() // old - int main
{
int x, y, z;
cout << "Enter three different integers: " << endl; // forgot << before endl;
cin >> x ; // old - cin >> "x" >> "y" >> "z" endl;
cin >> y ;
cin >> z ;
cout << endl;
if (x < y && z > y || z < y && x > y) cout << y; // removed ";" after if() for all 3 and fixed inside the if
if (z < x && y > x || y < x && z > x) cout << x;
if (y < z && x > z || x < z && y > z) cout << z; // old - cout << y;
return 0; // old - return ;
} // no ; at the end of a function


3.



4.



Or at least try to understand the answers. (hopefully I didn't make any stupid mistakes)

oops, I screwed up a and b for the first question lol
I won't give the answers tho, try them by yourself.

for question 1:
a)
Integer is too small.
b )
Integer is too small.
7
c)
15
d)
8
e)
16

For question 2:
comments // indicate what was wrong with the code, the code itself is corrected and tested



for the 3rd one:



for 4th:



This post was edited by NeX_1337 on Oct 29 2013 12:49am