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;
Control structures
Control structures are block of statements that analyze the value of variables and determine the flow of execution based on those values. When a program is running, the CPU executes the code line by line. After sometime, the program reaches the point where it has to make a decision on whether it has to go to another part of the code or repeat execution of certain part of the code. These results affect the flow of the program's code and these are called control structures.
Switch Statement
The switch statement is a key feature that is used by the programmers a lot in the world of programming and coding, as well as in information technology in general. The switch statement is a selection control mechanism that allows the variable value to change the order of the individual statements in the software execution via search.
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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;
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Write a for statement to add all the numbers divisible by 3 or 5 between 1 and 1000.
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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?
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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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