Loops

Question

Pls anyone can explain difference in for loop and while loop
And how can that use in coding

Answer 1

Nandini Reddy , here is a brief description (python):

In General the difference is:

> for loop is mostly used when the number of iterations are known before starting iteration. This could be like:

- for num in range(1,10):
- for val in [1,3,7,2]:
There is loop variable, that get one value in each iteration, starting with the first (index= 0) element of the iterable. for loops can have a break or a continue statement.

> while loop is used mostly when the number of iterations is not clear when starting the loop. This could be:
- while True:
- while count <= 50:
- while x <= len(inp_values):
A loop or counter (or other variables) can be used, variables has to be incremented or decremented by code. while loops can have a break or a continue statement.

Answer 2

https://www.sololearn.com/Discuss/400480/?ref=app
https://www.sololearn.com/Discuss/1522646/?ref=app

Answer 3

Nandini Reddy U can use the search bar feature in Sololearn to avoid duplicates and also ,u can find much detailed answers.
I have posted some similar threads above .Go through it.
Happy Coding......

Answer 4

In for loop, we know how many iterations should be done, but we don't know number of iterations in while loop.

Like in modern programming languages, in for loop, we have range of numbers, so the number of iterations r fixed, and in while loop, we do the iteration unless the specific condition remains true.

//for loop in kotlin:
for (i in 1..5) // here, "i" will be 1 to 5
println(i)

//while loop in kotlin:
var i = 1
while ( i < 5 ) {
println(i)
i++
}

here, the number of iterations r dependent upon the condition we r checking i.e., i < 5, and
increment(i++), which can also increased as per ur wish, so we don't know the number of iterations here.

I hope this helps u.
happy coding☺👍

Answer 5

Bakhromjon khasanboyev
++ X //pre increment , it first increment value of x and assign to the variable .

X++ //post increment,it takes current value of x and then increments.

Let it explain by small example:

Int a = 2;
Int b= a++;
Cout<<"a="<<a<<edl;
Cout<<"b="<<b;

//Output is
a=3
b=2

Int a=2;
Int b=++a;
Cout<<"a="<<a<<endl;
Cout<<"b="<<b;

//Output is
a=3
b=3

Answer 6

they r pretty the same , with some diff:
in JS :
===========================
while(condition is true){
//do something
//you have to take care of the condition so it will not loop forever
}
===========================
for(let i= 0 ; i<5 ; i++){
//do something
}
===========================
//the for loop above will do something 5 times.
×××××××××××××××××××××××
And you must google it , for better understanding

Answer 7

I had a question about C ++. Can you explain the difference between ++x and x ++? Please!