Laquelle des déclarations de boucle for suivantes n'est pas valide ?
Which of the following for loop statements is invalid?

Question

Laquelle des déclarations de boucle for suivantes n'est pas valide ? 
 Which of the following for loop statements is invalid?

Answer

for ( int i = 20; i >= 2; - -i )

Answer

for ( int i = 2; i <= 20; i = 2* i )

Answer

for ( int i = 99; i >= 0; i / 9 )

Answer

for ( int i = 7; i <= 77; i += 7 )

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