Eastern Mediterranean University
ITEC113
Algorithms and Programming Techniques
School of Computing and Technology
Information Technology
2010- 2011 Fall Semester
Instructors: Yeşim Kapsıl Çırak– Nazife Dimililer
Some example solutions are given for each of the loop
exercises below.
Exercises on loops
In the desired outputs shown below, the data entered from the keyboard is shown using a different and bigger font.
Solve all questions using all types of loops. Draw a flowchart, write pseudocode and the C program for each solution.
1- Write a program that prompts the user to enter a number. Use a loop to print as many “I love to program” on
screen as that number.
Desired Output:
Please enter a number: 4
I love to program.
I love to program.
I love to program.
I love to program.
PSEUDOCODE (USING FOR LOOP)
DISPLAY “Please enter a number”
INPUT num
FOR counter =1 to num with increment=1
DISPLAY “I love to program”
ENDFOR
FLOWCHART
START
“Please enter a
number”
num
Counterß 1
Counter ß
counter+1
?
Counter<=num
“I love to program”
TRUE
FALSE
END
C code
#include <iostream.h>
int main()
{
int counter;
int num;
cout<<"Please enter a number";
cin>>num;
for(counter=1;counter<=num;counter=counter+1)
{
cout<<"I love to program\n";
}
}
2- Write a program that asks the user to enter the beginning of a sequence (lower limit) and end of a sequence
(upper limit). Print square of all numbers between these two limits.
Please enter the lower limit: 4
Please enter the upper limit: 8
16
25
36
49
64
Pseudocode (using while loop)
DISPLAY “Lower Limit”
INPUT lower
DISPLAY “Upper Limit”
INPUT upper
counter ß lowerlimit
WHILE counter<=upperlimit
DISPLAY counter*counter
counter ß counter+1
ENDWHILE
FLOWCHART
START
Please enter
the lower limit
lowerlimit
Please enter
the upper limit
upperlimit
counter ß lowerlimit
?
counter<=upperlimit
TRUE
Counter*counter
counter ß counter+1
FALSE
END
C code
#include <iostream.h>
int main()
{
int lower,upper,counter;
cout<<"Please enter the lower limit ";
cin>>lower;
cout<<"Please enter the upper limit";
cin>>upper;
counter=lower;
while(counter<=upper)
{
cout<<counter*counter<<endl;
counter=counter+1;
}
}
3- Write a program that asks the user to enter two numbers: the lower and upper limits of a sequence. Compute
the summation, average, minimum and maximum of all numbers between these two limits using a loop.
Please enter the lower limit: 4
Please enter the lower limit: 8
Summation is 30
Average is 7.5
Minimum is 4
Maximum is 8
Pseudocode
DISPLAY “Please enter the lower limit”
INPUT lower
DISPLAY “Please enter the upperlimit”
INPUT upper
sum ß 0
counterß lower
WHILE counter<=upper
Sumßsum+counter
ENDWHILE
avgßsum/(upper-lower)
DISPLAY ”Sum”,sum
DISPLAY”Avg”, avg
DISPLAY “Max”, upper
DISPLAY “Min” ,lower
C code
#include <iostream.h>
int main()
{
int lower,upper,counter;
int sum;
float avg;
cout<<"Please enter the lower limit ";
cin>>lower;
cout<<"Please enter the upper limit";
cin>>upper;
counter=lower;
while(counter<=upper)
{
sum=sum+counter ;
counter=counter+1;
}
avg=sum/(upper-lower);
cout<<"The summation is "<<sum<<endl;
cout<<"The average is "<<avg<<endl;
cout<<"The maximum is "<<upper<<endl;
cout<<"The minimum is "<<lower<<endl;
}
4- Write a program that asks the user to enter 10 numbers and count the total number of these numbers that are
greater than 50.
Please enter number 1 :23
Please enter number 2 :15
Please enter number 3 : -15849
Please enter number 4 : 1
Please enter number 5 : 88
Please enter number 6 : 99
Please enter number 7 :71
Please enter number 8 : 45
Please enter number 9 : 9
Please enter number 10 :79
You have typed 4 numbers that are greater than 50.
Pseudocode (UISNG WHILE)
counter ß 1
large_counter ß 0
WHILE counter<=10
DISPLAY “Please enter number “, counter
INPUT num
IF num>50
large_counterß large_counter+1
ENDIF
ENDWHILE
DISPLAY “You have entered”, large_counter,”numbers that are greater than 50”
Flowchart
START
counter ß 1
large_counter ß 0
?
counter<=10
TRUE
“Please enter a
number”
num
?
Num>=50
TRUE
large_counter ß
large_counter+1
FALSE
counter ß counter+1
FALSE
END
C code
#include <iostream.h>
int main()
{
int counter,large_counter,num;
counter=1;
large_counter=0;
while(counter<=10)
{
cout<<"Please enter number "<<counter<<":";
cin>>num;
if(num>=50)
{
large_counter=large_counter+1;
}
counter=counter+1;
}
cout<<"You have entered "<<large_counter<<" numbers that are greater than 50.";
}