Algorithmique et Programmation - STI2D/STL

Interprétation

Exercice 1 : Resultat de test Si/Sinon

On considère l'algorithme ci-dessous :

\(b\) ← \(3 + a\)
\(c\) ← \(a\)
\(a\) ← \(3 + a\)
Si \(b \gt c\) :
\(b\) ← \(a + c\)
Sinon 
\(b\) ← \(a - b\)

Si \(a=3\), quelle est la valeur finale de \(b\) ?

Exercice 2 : Initiation - Trois variables, deux lectures, un calcul

On considère l'algorithme ci-dessous :

\(N\) ← \(b \times \left(6 + a\right)\)

Si \(a=9\) et \(b=7\), quelle est la valeur finale de \(N\) ?

Exercice 3 : Initiation - Test simple et géométrie

On considère l'algorithme ci-dessous :

Tracer une droite \((d)\)
Choisir une forme géométrique au hasard
Si la forme choisie est un triangle :
Tracer un triangle \(ABC\)
Sinon 
Tracer un rectangle \(ABCD\)
Tracer le symétrique de la forme par rapport à la droite \((d)\)

Trouver parmi les figures suivantes, celles qui ont pu être tracées avec cet algorithme.

1.

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2.

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3.

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4.

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Exercice 4 : Resultat de boucle Pour

On considère l'algorithme ci-dessous :

\(S\) ← \(0\)
Pour \(i\) allant de \(1\) à \(N\) :
\(S\) ← \(S + i\)

Si \(N=4\), quelle est la valeur finale de \(S\) ?

Exercice 5 : Resultat de boucle Tant que (reste de division)

On considère l'algorithme ci-dessous :

Tant que \(a \gt b\) :

\(a\) ← \(a - b\)

Si \(a=50\) et \(b=21\), quelle est la valeur finale de \(a\) ?

Revenir au choix du niveau