Algorithmique du cycle 4 - 3e

Niveau 1 : boucles "Répéter n fois "

Exercice 1 : Déplacement véhicule - Utiliser une boucle plus complexe (5/6)

En utilisant toutes les connaissances découvertes dans les exercices précédents,

Réaliser un algorithme permettant d'amener le véhicule face à la tour d'arrivée.

{"options": {"blocks": {"road_forward": {"previous_statement": true, "next_statement": true, "colour": 160, "tooltip": "Avancer d'une case tout droit", "inputs": [{"type": "dummy_input", "fields": [{"text": "Avancer de 1 case", "type": "text"}], "align": "left"}]}, "base_simplerepeattimes": {"compound": {"blocks": {"base_repeattimes": {"previous_statement": true, "next_statement": true, "colour": 120, "tooltip": "Execute une suite d'instructions un certain nombre de fois", "inputs": [{"type": "value_input", "fields": [{"text": "R\u00e9p\u00e9ter", "type": "text"}], "align": "left", "name": "ntimes", "check": "Number"}, {"type": "dummy_input", "fields": [{"text": "fois", "type": "text"}], "align": "left"}, {"type": "statement_input", "fields": [], "align": "left", "name": "code_repeat", "check": null}], "inline": true}, "base_numberinput": {"output": "Number", "colour": 260, "tooltip": "Fourni un nombre", "inputs": [{"type": "dummy_input", "fields": [{"name": "value", "default": 0.0, "type": "number_input"}], "align": "left"}]}}, "ast": {"type": "base_repeattimes", "ntimes": {"type": "base_numberinput", "alias": {"value": "ntimes"}}}}, "previous_statement": true, "next_statement": true, "colour": 120, "tooltip": "Execute une suite d'instructions un certain nombre de fois", "inline": true}, "road_turnright": {"previous_statement": true, "next_statement": true, "colour": 160, "tooltip": "Tourner \u00e0 droite", "inputs": [{"type": "dummy_input", "fields": [{"text": "Tourner \u00e0 droite \u21b7", "type": "text"}], "align": "left"}]}, "road_turnleft": {"previous_statement": true, "next_statement": true, "colour": 160, "tooltip": "Tourner \u00e0 gauche", "inputs": [{"type": "dummy_input", "fields": [{"text": "Tourner \u00e0 gauche \u21b6", "type": "text"}], "align": "left"}]}, "base_start": {"next_statement": true, "colour": 65, "tooltip": "D\u00e9marrage de l'algorithme", "inputs": [{"type": "dummy_input", "fields": [{"text": "Au d\u00e9marrage", "type": "text"}], "align": "left"}], "creatable": false, "on_event": "start"}}, "toolbox": [{"type": "base_simplerepeattimes", "ntimes": 2.0}, {"type": "road_forward"}, {"type": "road_turnleft"}, {"type": "road_turnright"}]}, "ast": [[{"type": "base_start", "deletable": false, "editable": false}]]}

Exercice 2 : Déplacement véhicule - Révision des boucles (1/6)

En utilisant les connaissances découvertes dans l'activité sur les boucles, réaliser un algorithme permettant d'amener le véhicule face à la tour d'arrivée.

Exercice 3 : Déplacement véhicule - Trouver son chemin parmi plusieurs possibles (6/6)

Réaliser un algorithme permettant d'amener le véhicule à côté de la tour d'arrivée et positionné face à elle.

Attention : Vous ne pouvez utiliser que 10 blocs en tout !

{"options": {"blockly": {"maxBlocks": 10}, "blocks": {"road_turnright": {"previous_statement": true, "next_statement": true, "colour": 160, "tooltip": "Tourner \u00e0 droite", "inputs": [{"type": "dummy_input", "fields": [{"text": "Tourner \u00e0 droite \u21b7", "type": "text"}], "align": "left"}]}, "road_forward": {"previous_statement": true, "next_statement": true, "colour": 160, "tooltip": "Avancer d'une case tout droit", "inputs": [{"type": "dummy_input", "fields": [{"text": "Avancer de 1 case", "type": "text"}], "align": "left"}]}, "base_simplerepeattimes": {"compound": {"blocks": {"base_numberinput": {"output": "Number", "colour": 260, "tooltip": "Fourni un nombre", "inputs": [{"type": "dummy_input", "fields": [{"name": "value", "default": 0.0, "type": "number_input"}], "align": "left"}]}, "base_repeattimes": {"previous_statement": true, "next_statement": true, "colour": 120, "tooltip": "Execute une suite d'instructions un certain nombre de fois", "inputs": [{"type": "value_input", "fields": [{"text": "R\u00e9p\u00e9ter", "type": "text"}], "align": "left", "name": "ntimes", "check": "Number"}, {"type": "dummy_input", "fields": [{"text": "fois", "type": "text"}], "align": "left"}, {"type": "statement_input", "fields": [], "align": "left", "name": "code_repeat", "check": null}], "inline": true}}, "ast": {"type": "base_repeattimes", "ntimes": {"type": "base_numberinput", "alias": {"value": "ntimes"}}}}, "previous_statement": true, "next_statement": true, "colour": 120, "tooltip": "Execute une suite d'instructions un certain nombre de fois", "inline": true}, "road_turnleft": {"previous_statement": true, "next_statement": true, "colour": 160, "tooltip": "Tourner \u00e0 gauche", "inputs": [{"type": "dummy_input", "fields": [{"text": "Tourner \u00e0 gauche \u21b6", "type": "text"}], "align": "left"}]}, "base_start": {"next_statement": true, "colour": 65, "tooltip": "D\u00e9marrage de l'algorithme", "inputs": [{"type": "dummy_input", "fields": [{"text": "Au d\u00e9marrage", "type": "text"}], "align": "left"}], "creatable": false, "on_event": "start"}}, "toolbox": [{"type": "base_simplerepeattimes"}, {"type": "road_forward"}, {"type": "road_turnleft"}, {"type": "road_turnright"}]}, "ast": [[{"type": "base_start", "deletable": false, "editable": false}]]}

Exercice 4 : Dessiner un carré de côté proposé par l'utilisateur

Utiliser un algorithme pour dessiner un carré de côté \(90\) à partir du point \((30;140)\).

{"options": {"blocks": {"drawing_turn": {"previous_statement": true, "next_statement": true, "colour": 160, "tooltip": "Tourner d'un angle", "inputs": [{"type": "dummy_input", "fields": [{"text": "Tourner de", "type": "text"}, {"name": "angle", "default": 0, "type": "angle"}, {"text": "degr\u00e9s", "type": "text"}], "align": "left"}], "inline": true}, "base_setvar": {"previous_statement": true, "next_statement": true, "colour": 330, "tooltip": "Affecter une valeur \u00e0 une variable", "inputs": [{"type": "value_input", "fields": [{"text": "mettre", "type": "text"}, {"name": "var_name", "default": "x", "type": "variable"}, {"text": "\u00e0", "type": "text"}], "align": "left", "name": "value", "check": null}]}, "base_varvalue": {"output": true, "colour": 330, "tooltip": "Fourni la valeur d'une variable", "inputs": [{"type": "dummy_input", "fields": [{"name": "var_name", "default": "x", "type": "variable"}], "align": "left"}]}, "base_simplerepeattimes": {"compound": {"blocks": {"base_numberinput": {"output": "Number", "colour": 260, "tooltip": "Fourni un nombre", "inputs": [{"type": "dummy_input", "fields": [{"name": "value", "default": 0.0, "type": "number_input"}], "align": "left"}]}, "base_repeattimes": {"previous_statement": true, "next_statement": true, "colour": 120, "tooltip": "Execute une suite d'instructions un certain nombre de fois", "inputs": [{"type": "value_input", "fields": [{"text": "R\u00e9p\u00e9ter", "type": "text"}], "align": "left", "name": "ntimes", "check": "Number"}, {"type": "dummy_input", "fields": [{"text": "fois", "type": "text"}], "align": "left"}, {"type": "statement_input", "fields": [], "align": "left", "name": "code_repeat", "check": null}], "inline": true}}, "ast": {"type": "base_repeattimes", "ntimes": {"type": "base_numberinput", "alias": {"value": "ntimes"}}}}, "previous_statement": true, "next_statement": true, "colour": 120, "tooltip": "Execute une suite d'instructions un certain nombre de fois", "inline": true}, "drawing_reset": {"previous_statement": true, "next_statement": true, "colour": 210, "tooltip": "Effacer tout", "inputs": [{"type": "dummy_input", "fields": [{"text": "Effacer tout", "type": "text"}], "align": "left"}], "inline": true}, "drawing_moving_position": {"previous_statement": true, "next_statement": true, "colour": 210, "tooltip": "Relever le stylo", "inputs": [{"type": "dummy_input", "fields": [{"text": "Relever le stylo", "type": "text"}], "align": "left"}], "inline": true}, "drawing_set_turn": {"previous_statement": true, "next_statement": true, "colour": 160, "tooltip": "S'orienter avec un angle", "inputs": [{"type": "dummy_input", "fields": [{"text": "S'orienter \u00e0 ", "type": "text"}, {"name": "angle", "default": 0, "type": "angle"}, {"text": "degr\u00e9s", "type": "text"}], "align": "left"}], "inline": true}, "base_start": {"next_statement": true, "colour": 65, "tooltip": "D\u00e9marrage de l'algorithme", "inputs": [{"type": "dummy_input", "fields": [{"text": "Au d\u00e9marrage", "type": "text"}], "align": "left"}], "creatable": false, "on_event": "start"}, "drawing_forward_var": {"previous_statement": true, "next_statement": true, "colour": 160, "tooltip": "Avancer d'un certain nombre de pixels", "inputs": [{"type": "value_input", "fields": [{"text": "Avancer de", "type": "text"}], "align": "left", "name": "npixels", "check": null}], "inline": true}, "base_numberinput": {"output": "Number", "colour": 260, "tooltip": "Fourni un nombre", "inputs": [{"type": "dummy_input", "fields": [{"name": "value", "default": 0.0, "type": "number_input"}], "align": "left"}]}, "drawing_forward": {"previous_statement": true, "next_statement": true, "colour": 160, "tooltip": "Avancer d'un certain nombre de pixels", "inputs": [{"type": "dummy_input", "fields": [{"text": "Avancer de", "type": "text"}, {"name": "npixels", "default": 10.0, "type": "number_input"}], "align": "left"}], "inline": true}, "drawing_writing_position": {"previous_statement": true, "next_statement": true, "colour": 210, "tooltip": "Mettre le stylo en posiion d'\u00e9criture", "inputs": [{"type": "dummy_input", "fields": [{"text": "Stylo en \u00e9criture", "type": "text"}], "align": "left"}], "inline": true}, "drawing_move_to": {"previous_statement": true, "next_statement": true, "colour": 160, "tooltip": "Se placer sur le pixel (x; y)", "inputs": [{"type": "dummy_input", "fields": [{"text": "Aller \u00e0 x:", "type": "text"}, {"name": "x", "default": 10.0, "type": "number_input"}, {"text": "y:", "type": "text"}, {"name": "y", "default": 10.0, "type": "number_input"}], "align": "left"}], "inline": true}}, "toolbox": [{"type": "base_numberinput"}, {"type": "base_setvar", "var_name": "c\u00f4t\u00e9"}, {"type": "base_simplerepeattimes", "ntimes": 0.0}, {"type": "base_varvalue", "var_name": "c\u00f4t\u00e9"}, {"type": "drawing_forward", "npixels": 0.0}, {"type": "drawing_forward_var"}, {"type": "drawing_moving_position"}, {"type": "drawing_turn", "angle": 0}, {"type": "drawing_writing_position"}]}, "ast": [[{"type": "base_start", "deletable": false, "editable": false}, {"type": "drawing_reset"}, {"type": "drawing_move_to", "x": 30.0, "y": 140.0}, {"type": "drawing_set_turn", "angle": 0}, {"type": "drawing_writing_position"}, {"type": "base_setvar", "value": {"type": "base_numberinput", "value": 90.0}, "var_name": "c\u00f4t\u00e9"}, {"type": "drawing_forward_var", "npixels": {"type": "base_varvalue", "var_name": "c\u00f4t\u00e9"}}, {"type": "drawing_turn", "angle": 90}, {"type": "drawing_forward_var", "npixels": {"type": "base_varvalue", "var_name": "c\u00f4t\u00e9"}}, {"type": "drawing_turn", "angle": 90}]]}

Exercice 5 : Déplacement véhicule - Fonctions - Rappel sur les boucles (1/8)

Pour éviter de répéter plusieurs fois une même opération, il est possible d'utiliser des boucles. Complétez l'algorithme suivant pour placer le véhicule devant la tour.

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