What is the difference of the structure "while" and repeat in VisualG?

The main thing is that the condition of enquanto is evaluated right on its input, so it can not even execute anything of the loop if the condition is already false, while (excuse the pun :) ), that the condition of repita is only evaluated for the first time at the end of the first execution of the block.

Is also different because enquanto contained while (no pun intended) the condition is true, and in repita it repeats until it reaches that condition, so it repeats as long as the condition is false.

var i: inteiro
inicio
i <- 0
enquanto i < 10 faca
   escreva(i)
   i <- i + 1
fimenquanto

var i: inteiro
inicio
i <- 0
repita
   escreva(i)
   i <- i + 1
ate i >= 10

I put on GitHub for future reference .

See what is the utility and importance of " do... while"?. do-while is a mixture of the two. It always lets run once, ma the output condition is false, equal is in while. In practice few languages, none strongly mainstream uses a construction equivalent to repita.