PRE-LAB
ASSIGNMENTS and LAB ASSIGNMENTS.
NOTE: Pre-Labs are not graded, lab assignments are graded.
PRE-LAB
1)
Open and run the nestloop
program. If single stepping, you
may want to change each cout statement to cerr.
//
nestloop.cpp
// demonstrates nested for loops
#include <iostream>
using
namespace std;
void
main(void)
{
int i,j;
cout << "BEGIN\n";
for(i = 1; i <= 3; i++)
{
cout << " Outer loop: i =
" << i << '\n';
for(j = 1; j <= 4; j++)
cout <<
"
Inner loop: j = " << j << '\n';
} // end of outer for
cout << "END\n";
} //
end of program
PRE-LAB
2)
Open and run fill.cpp.
//
fill.cpp
// demonstrates nested for loops
#include <iostream>
using namespace std;
void
main(void)
{
int col, row ;
cerr << endl << endl ;
for (row = 1; row <=12; row++)
{
cerr << endl ;
for ( col = 1; col <=20 ; col++)
cerr <<
"*" ;
} // end of outer for
cerr << endl << endl ;
}
Keep in mind that the initialization and conditional
statements in each loop can be modified to make other patterns appear as output.
Try single stepping (step over with a watch window for local variables)
through the outer and inner loops while observing how the output is created.
Try changing the values of 12 or 20 and observe the results.
The inner initialization (col = 1;) can use the current value of row (for
example, col = row + 1 ; ) as well as the conditional statement ( col <= 20 )
can be changed to include the value of row in the comparison. (for example, col
< row – 2; ) Experiment with
changing either the initialization and/or the conditional test on the inner loop
and observe the results.
PRE-LAB
3)
Open the binary.cpp file and run it.
//
binary.cpp
//
Using nested for loops, display binary values from zero to fifteen
#include<iostream>
using namespace std;
void
main(void)
{
#include<iostream>
using namespace std;
void main(void)
{
#include<iostream>
using namespace std;
void main(void)
{
int i,j,k,l;
int sum = 0;
cout << "i j k l\n\n";
for (i = 0; i <= 1; i++)
{
for (j = 0; j <= 1; j++)
{
for (k = 0; k <= 1; k++)
{
for (l = 0; l
<= 1; l++)
{
cout << i << ' ' << j << ' ' << k << ' '
<< l << "\t \t" << sum++ << '\n';
}
}
}
}
}
PRE-LAB
4)
Open and run continue.cpp
//
continue.cpp
// demonstrates continue and break statements
#include <iostream>
using namespace std;
void
main(void)
{
int
i;
for(i = 1; i <= 10; i++)
{
if (i = = 5)
continue;
cout
<< i << '\n';
if ( i = = 9)
{
cout <<
"time to break" << endl;
break;
} // end of if
} // end of for
}
// end of program
PRE-LAB
5)
Open and run the reps program.
Enter some invalid data to cause the nested loop to repeat.
//
reps.cpp for loop, do while and
switch case demo
#include
<iostream>
using namespace std;
const char ERROR = '\0';
void
main(void)
{
int num_reps;
int i; // counter used by
for loop
int democrats = 0, republicans = 0, independents = 0;
int reforms = 0 , libertarians = 0 ;
char party;
cout << "\nHow many U.S. Representatives does your
state have? ";
cin >>
num_reps; // ask user for number of representatives
cout << "Enter the party affiliation for each
Representative.\n";
cout << "Enter D for Democrat, R for
Republican,\n";
cout << "F for reform, L for Libertarian,\n";
cout << "and I for independents or other
parties.\n";
for (i = 1; i <= num_reps; i++)
{
do
{
cout << "Party
of representative #" << i << ": ";
cin
>> party;
switch(party)
{
case 'D':
case 'd':
// if democrat,
democrats++; //
increment democrats counter
break;
case 'R':
case 'r':
// if republican,
republicans++; // increment
republicans counter
break;
case 'I':
case 'i':
// if independent
independents++; // increment
independents counter
break;
case 'F':
case 'f' : // if reform
reforms++ ;
// increment counter
break;
case 'L':
case 'l':
// if libertarian
libertarians++; // increment
counter
break;
default:
cout << "Invalid entry. Enter D,R,F,L or I. \n";
party
= ERROR;
break;
} //
end of switch structure
} while (party = = ERROR); // loop
again if invalid choice is made
} // end of for loop
cout << "\nState rep party representation is:
\n" << democrats << " Democrat, \n"
<< republicans << "
Republican,\n" << independents
<< " independent, \n"
<< reforms << " Reform, and \n"
<< libertarians <<
"Libertarian \n\n" ;
}
// end of program
LAB
ASSIGNMENT:
2 Problems
1.
Write a program that will produce the following output on screen:
X
X
X
X
X
X
X
X
X
X
X
X
X
Assume
that the first row begins at the left edge of the screen and the last X in the
first row is separated from the first X by 5 spaces. You may NOT use tabs or gotoxy for positioning.
You MUST use a for loop or nested for loops.
The only legal cout statements that you can use to produce the big X are:
cout <<
'X' ;
or
cout <<
'
'
; // one
space surrounded by quotes
or
cout <<
endl ;
If
you are not sure of the specs, please ask.
Submit
your program as bigx.cpp
Lab
2.
A mail order house sells five different products whose retail prices are:
1-- $2.89, 2 -- $4.50, 3 -- $9.98, 4 --
$4.49 and product 5 -- $6.87. Write a program that reads a series of pairs
of number as follows:
a)
Product
b) Quantity sold for one day
Your
program should use a switch statement to help determine the retail price for
each product. Your program should calculate and display the total retail value
of all products sold.
Submit
your program as sales.cpp
Use
a while loop with a sentinel value for loop. Use a switch statement for decision
making.
Keep reading a pair of numbers. If the first number is NOT -1 (sentinel) value,
then read the second value. First value read is the product, second value read
is the number for quantities sold. In your switch/case, you should calculate
that sales of the product.
Example:
case 1:
TotalSalesProduct1 =
TotalSalesProduct1 + (2.89 * quantitySold);
