Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Question
  1. What is the output of the following program segment?

long num =5;

int i;

for ( i=1; i < 3; i++)

{

num = num + num * (num – i);

cout << num << “ “;

}

cout << endl;









  1. Write a for statement to add all the numbers divisible by 3 or 5 between 1 and 1000.









  1. Rewrite the following while loop as a for loop and a do while loop.

int i = 0, value = 0;

while ( i <= 20)

{

if ( i % 2 == 0 && i <= 10 )

value = value + i * i;

else if (i % 2 ==0 && I > 10)

value = value + 1

else

value = value – i;

i = i + 1;

}

cout << “value = “ << value <<endl;

 

What is the output of this loop?





  1. The do … while loop in the following program is supposed to read some numbers until it reaches a sentinel (in this case, -1). It is suppose to add the double of each of the numbers except for the sentinel. If the data looks like:

12 5 30 48 -1

the program does not add the numbers correctly. Correct the program so that it adds the double of the numbers correctly.



#include <iostream>

using namespace std;

int main()

{

int total = 0, count =0, number = 0;



do

{

cin >> number;

total = total + (number * 2);

count ++;

}

while (number != -1);

 

cout << “The number of the data read is” << count << endl;

cout << “The sum of the numbers entered is “ << total

<< endl;

 

return 0;

}



 

5. Rewrite the program of problem 4 using a while loop.



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