how to use do while loop | repetition control structure | #4

Описание: How to use do while loop in programming? You use do while loop in programming for repetition of code execution in a block of code.
In today’s class, I will show how to use do while loop and for loop construct for repetition.
The do while loop is written does in pseudocode:
DOWHILE condition p is true
Statement(s) to be repeated here
ENDDO
Explanation:
1. The logical condition p is tested on every pass
2. If condition p is found to be true, then control goes into the loop and execute statement(s) once.
3. Control then returns to test condition p
4. If condition p is found to be false, control passes to the next statement after ENDDO; otherwise control goes into the loop again to execute statement(s) written there. This continues until condition p is false.
A statement written inside the do while loop must alter the condition p to become false, otherwise the loop becomes an endless loop.
Three things are necessary to the setting up of a do while loop
1. The initialization of the condition to be tested to an initial value. The condition is initialize just before the condition testing.
2. The testing of the condition is at the beginning of the loop
3. The only way to terminate the loop is to render the do while loop condition to false
You must write a statement within the statement do while loop block which will eventually change the condition so that the condition becomes false. Failure to do so will definitely result in an endless loop.
In our example for today, we consider the problem statement:
Every day a weather station receives 15 temperatures expressed in degrees Fahrenheit. A program is required to accept each Fahrenheit temperature, convert it to Celsius and display the converted temperature to the screen.
In this example as show in the video, you need to know how to use do while loop in programming or for loop to be able to solve the problem.
This is the solution algorithm in pseudocode as shown in the video also:
INITIALIZE temperature_count to zero
DOWHILE temperature_count less than 15
GET Temp_Fahrenheit
COMPUTE Temp_Centigrade
DISPLAY Temp_C
ADD 1 to temperature_count
ENDDO
The above pseudocode is coded into PHP and the application is test ran to see how to use do while loop in programming. The program is thereafter implemented using a for loop.
Head to the video to see in detail how to use do while loop in programming.
Enjoy the video.