What is the display produced by the following sequence of instructions, assuming the user has entered the values 50, 25, 40, 45, 42 in order?

n <- 42
Do
    Read(val)
    If val < n Then 
        Write("More ")
    Else
        If val > n Then 
            Write("Less ")
        End If
    End If
While val != n
Write("Bravo!")

These lines of instruction may contain errors. Assume that all variables have been correctly declared. Find the errors.

Read(n)
try <- 5
Do
    Read (val)
    Write("You have " + try + " tries left")
    try <- try - 2
While (try != 0)

What is the value of the variable count at the end of execution of the following sequence of instructions ?

count <- 0
For i <- 2 to 5 Do
    For j <- 1 to 2 Do
        If i % j = 0 Then
            count <- count + 1
        End If
    End For
End For

What is the number of stars displayed by the following lines of instruction ?

n <- 5
For i <- 1 to n Do
    For j <- n to i [-1] Do
        Write("* ")
    End For
    Write("\NL")
End For

What is the output produced by the following sequence of instructions?

res <- 1
x <- 2
n <- 3
For i <- 1 to n Do
    res <- res * x
End For
Write(x, "power", n = res)

Which of the following statements is true?

i <- 1
While i < 10 Do
    If i % 2 = 0 Then 
        Write(i)
    End If
    i <- i + 1
End While

These lines of instruction may contain errors. Assume that all variables have been correctly declared. Find the errors.

arr <- {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
n <- 10
For i <- 1 to n Do
    arr[i] <- arr[i] * 2
End For
Write(arr)

How many stars are displayed at the end of the execution of the following instruction lines?

n <- 5
For i <- 1 to n Do
    j <- 1
    While j < i Do
         Write("* ")
         j <- j + 1
    End While
    Write("\NL")
End For

Le

gain de l’ampli-op suivant est :

Sachant que R₁ = R₃ = 30 k, R₂ = 100 k et R₄ = 1 k. Calculer l'impédance d'entrée Z_e :