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Looping Constructs
There's only one type of loop in V language, like Go which can be used in many ways.

for loop

for loops offer a quick and easy way to do something repeatedly. They're handy, if you want to run the same code over and over again, each time with a different value. You can think of a loop as a computerized version of the game where you tell someone to take X steps in one direction then Y steps in another; for example, the idea "Go five steps to the east" could be expressed this way as a loop:
for i := 0; i < 5; i++ {
println('Walking one step')
}
V has the for looping construct and the loop can be written in different ways:
  1. 1.
    in operator for array/map
ages := [18, 25, 32, 43, 50]
for age in ages {
println(age)
}
Note: The value is read-only.
  1. 1.
    for loop with a condition
This is a control flow statement that allows code to be executed repeatedly based on a given Boolean condition. There are no parentheses surrounding the condition, and the braces are always required.
mut factorial := 1
mut counter := 1
for {
counter++
if counter > 5 {
println(factorial)
break
}
factorial = factorial * counter
}
println(counter)
Output
120
6
A for loop with a break statement can always be made shorter by placing the inverse condition right after for, making it equivalent with the while statement in other languages.
mut factorial := 1
mut counter := 1
for counter <= 5 {
factorial = factorial * counter
counter++
}
println(factorial)
println(counter)
Output
120
6
  1. 1.
    Traditional C style
mut factorial := 1
mut counter := 1
for counter = 1; counter < 6; counter++ {
factorial = factorial * counter
if counter == 5 {
print(factorial)
continue
}
println(counter)
}
  1. 1.
    Infinite Loop
for loop can also be infinite
for {
println('foo')
}

Exercises

  1. 1.
    Write a V program to display the first 10 natural numbers.
  2. 2.
    Write a V program to find the sum of first 10 natural numbers.
  3. 3.
    Write a V program to print the integers inside an array and also print their mean.
  4. 4.
    Write a V program to read 10 numbers from keyboard and find their sum and average.
  5. 5.
    Write a V program to display the cube of the number upto given an integer.
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for loop
Exercises