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There are very specific differences between the three types of iteration (or repetition) which are important to understand when selecting which one to use. The table below outlines these differences.

Repetition Type	Counter increment	Initialization	Condition to loop
For	Automatic	Automatic	Continues until the counter reaches the value specified in the TO clause
Repeat- Until	Manual	Manual	Will only loop if the condition is false
While	Manual	Manual	Will only loop if the condition is true

The for loop above is very simple and allows us to pick up the three main parts of repetition. These are-

for (<start value> ; <condition>; <increment>)

Below is the steps you must follow to perform the conversion -

Swap the start and end of the loop for the new keywords
Change the start value
Add/remove increment code
Alter the condition

Consider this for loop -

for(int a=0; a<5; a = a + 1){
// do stuff
}

Step one - swap keywords

while(int a=0; a<5; a = a + 1){
// do stuff
}

Step two - change the start value

int a=0;
while(a<5; a = a + 1){
// do stuff
}

Step three - increment

int a=0;
while(a<5){
// do stuff
a = a + 1;
}

Step four - (not needed for java)

next nested for loops >>

Note - In psudeocode we need to do some more work. The image below shows this

Basics

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