// introducing if else

#include <iostream.h>

void main()
{
int c;
c=1;

while(XXXXX)
 {
  cout<<"enter a value to cube or negative to quit "<<endl;
  cin>>c;

  if(XXXXX)
    {
     cout<<"square is  "<<c*c*c<<endl;
    }
  else
    {
     cout<<"bye for now"<<endl;
    }
 }
}


What tests should be put in place of the XXXXXs ?



/// ----------------double loop 1;

#include <iostream.h>

void main()
{
int i;
int j;

i=1;
while(i<=10)
 {
 j=0;
 while(j<i)
 {
  cout<<"*";
  j=j+1;
 } 
 cout<<endl;
 i=i+1;
 }
}

Look at this program. 

1) Match up the opening and closing brackets and label the inner and outer loops.


2) How many times will we go through the outer loop? What Values will i take?


3) When i is equal to 6 how many times will you go through the inner loop?   what values will j take?


4) Before cutting and pasting, guess what the program will do


Note this is a technique for doing simple bar graphs

//--------------------------------------------


// File: array problem 1

#include <iostream.h>

void main()
{
double temp[5];
int c;
temp[0]= -2.5;
temp[1]= -0.4;
temp[2]= 1.1;
temp[3]= 3.7;
temp[4]= 2.3;

c=0;
while(c<5)
  {
   cout<<"Temperature reading "<<c<<" is "<<temp[c]<<endl;
   c=c+1;
  } 
}

This is a program to handle outside air temperature readings taken during the day every 2 hours.
Cut and paste this program so that you can run it. It is essential that you understand how it works.
1) create a new double variable called "tot" and set it to zero before the loop.
2) In the loop add temp[c] to the value in tot (and put the value in tot).
3) After the loop calculate the average temperature by dividing tot by the number of readings and print it out.
(Show me your program running).

4) Within the loop create an if statement which will test true for all but the first go through the loop.
5) Create a new double variable called 'diff'. In the body of this if statement to calculate the difference in temperature 
from the last reading i.e between temp[c-1] amd temp[c]. Print out this value.
6) Use an if/else statement that uses diff to determine whether the temperature is increasing or its getting colder. Print an appropriate message.






// array problem 2;

#include <iostream.h>

void main()
{
int a[5];
int i;

a[0]=4;
a[1]=8;
a[2]=1;
a[3]=3;
a[4]=6;
i=0;
while(i<5)
 {
   cout<<"Store "<<i<<" has "<<a[i]<<" units in stock "<<endl;
   i=i+1;
  }//while
}

This program is supposed to process information about the stock of a certain item at various stores in a chain.
1) Add integer variables 'most' and 'storemost'.  These will hold the values of the most units (found so far) and the number of the store that 
has these units. 
2) Set 'most' to zero before the loop;
3) In the loop think of a test (for an if statement) that will detect whether the store we are currently looking at (i) has more units than the most
that we have found so far. 
4) Create an if statement that will, if necessary update the values in 'most' and 'most store'.
5) After the loop add a statement that tells us which store has the most and how many it has.
6) Let me see your running program.

7) Repeat these Steps to also find the store with the minimum units (you need two more variables).
8) Calculate the difference (new variable diff) between the most and the least.  Print this out.
9) Move diff/2 units from the store with the most to the store with the least.
10) Print out the new distribution of stock.