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Algorigrammes : Mermaid et Graphviz

Transforme le même pseudocode en algorigramme Mermaid ou Graphviz. Les deux moteurs partagent la même sémantique ; Graphviz privilégie une géométrie déterministe.

Les diagrammes ci-dessous sont rendus directement par MkDocs à partir des sources Mermaid et Graphviz : aucune image statique approximative n'est utilisée.

Exemple complet : jeu du nombre mystère

On saisit d'abord n, la borne supérieure. Le programme choisit au hasard une cible entre 1 et n, puis demande des propositions m. Quand la cible est trouvée, Sortir interrompt la boucle.

Saisir n
cible = aleatoire(1, n)
m = cible + 1
Tant Que m n'est pas égal à cible:
    Saisir m
    Si m > cible Alors:
        Afficher "Trop grand !"
    Sinon Si m < cible Alors:
        Afficher "Trop petit !"
    Sinon:
        Afficher "Gagné !"
        Sortir
    Fin
Fin

%%{init: {"flowchart":{"curve":"basis","nodeSpacing":55,"rankSpacing":72,"htmlLabels":false},"layout":"elk","look":"classic","elk":{"preset":"modelOrder","nodePlacementStrategy":"LINEAR_SEGMENTS","nodePlacementAlignment":"NONE","layeringStrategy":"NETWORK_SIMPLEX","cycleBreakingStrategy":"MODEL_ORDER","considerModelOrder":"NODES_AND_EDGES","forceNodeModelOrder":true,"keepEntryNodeOnTop":true,"straightenEdges":true,"lineHops":false,"mergeEdges":false},"htmlLabels":false}}%%
%% pseudocode-layout-profile: validated-loop-attached-edges-v22
flowchart TD
    n1(["Début"])
    n2(["Fin"])
    n3[/"Saisir n"/]
    %% pseudocode-edge e0 n1 n3 normal
    n1 e0@--> n3
    %% pseudocode-sequence e0 n1 n3
    n4["cible = aleatoire(1, n)"]
    %% pseudocode-edge e1 n3 n4 normal
    n3 e1@--> n4
    %% pseudocode-sequence e1 n3 n4
    n5["m = cible + 1"]
    %% pseudocode-edge e2 n4 n5 normal
    n4 e2@--> n5
    %% pseudocode-sequence e2 n4 n5
    n6{"Tant Que m n'est pas égal à cible ?"}
    %% pseudocode-edge e3 n5 n6 normal
    n5 e3@--> n6
    %% pseudocode-sequence e3 n5 n6
    subgraph loop1_body[" "]
        direction TB
    n7[/"Saisir m"/]
    n8{"m #62; cible ?"}
    %% pseudocode-edge e4 n7 n8 normal
    n7 e4@--> n8
    %% pseudocode-sequence e4 n7 n8
    n9[/"Afficher 'Trop grand !'"/]
    %% pseudocode-edge e5 n8 n9 branch
    n8 e5@-->|"Oui"| n9
    n10{"m #60; cible ?"}
    %% pseudocode-edge e6 n8 n10 branch
    n8 e6@-->|"Non"| n10
    n11[/"Afficher 'Trop petit !'"/]
    %% pseudocode-edge e7 n10 n11 branch
    n10 e7@-->|"Oui"| n11
    n12[/"Afficher 'Gagné !'"/]
    %% pseudocode-edge e8 n10 n12 branch
    n10 e8@-->|"Non"| n12
    n13["Sortir"]
    %% pseudocode-edge e9 n12 n13 normal
    n12 e9@--> n13
    %% pseudocode-sequence e9 n12 n13
    n14((" ")):::pseudocodeGhost
    %% pseudocode-edge e10 n9 n14 normal
    n9 e10@--- n14
    %% pseudocode-sequence e10 n9 n14
    %% pseudocode-edge e11 n11 n14 normal
    n11 e11@--- n14
    %% pseudocode-sequence e11 n11 n14
    end
    style loop1_body fill:none,stroke:none
    %% pseudocode-edge e12 n6 n7 branch
    n6 e12@-->|"Oui"| n7
    %% pseudocode-loop-continue e12 n6 n7
    %% pseudocode-edge e13 n14 n6 loop_back
    n14 e13@--> n6
    %% pseudocode-loop-back e13 n14 n6
    %% pseudocode-edge e14 n6 n2 branch
    n6 e14@-->|"Non"| n2
    %% pseudocode-loop-exit e14 n6 n2
    %% pseudocode-edge e15 n13 n2 normal
    n13 e15@--> n2
    %% pseudocode-sequence e15 n13 n2
    classDef pseudocodeGhost fill:transparent,stroke:transparent,color:transparent;

pseudocoden1:s->n3:nn3:s->n4:nn4:s->n5:nn5:s->n6:nn6:s->n7:nOuin6:e->__exit_top_3:wNonn7:s->n8:nn8:s->n9:nOuin8:e->n10:nNonn9:s->n14:nn10:s->n11:nOuin10:e->n12:nNonn11:s->n14:nn12:s->n13:nn13:s->n2:nn14:w->__return_bottom_1:e__return_bottom_1:n->__return_top_2:s__return_top_2:e->n6:w__exit_top_3:s->__exit_bottom_4:n__exit_bottom_4:w->n2:en1Débutn2Finn3Saisir nn4cible = aleatoire(1, n)n5m = cible + 1n6Tant Que m n'est pas égal à cible ?n7Saisir mn8m > cible ?n9Afficher "Trop grand !"n10m < cible ?n11Afficher "Trop petit !"n12Afficher "Gagné !"n13Sortir

Principales structures de programmation

Les exemples suivants isolent les structures de contrôle les plus courantes pour comparer rapidement leur rendu Mermaid et Graphviz.

Condition : Si … Alors … Sinon …

x = 5
Si x > 0 Alors:
    Afficher "positif"
Sinon:
    Afficher "nul ou négatif"
Fin

%%{init: {"flowchart":{"curve":"basis","nodeSpacing":55,"rankSpacing":72,"htmlLabels":false},"layout":"elk","look":"classic","elk":{"preset":"modelOrder","nodePlacementStrategy":"LINEAR_SEGMENTS","nodePlacementAlignment":"NONE","layeringStrategy":"NETWORK_SIMPLEX","cycleBreakingStrategy":"MODEL_ORDER","considerModelOrder":"NODES_AND_EDGES","forceNodeModelOrder":true,"keepEntryNodeOnTop":true,"straightenEdges":true,"lineHops":false,"mergeEdges":false},"htmlLabels":false}}%%
%% pseudocode-layout-profile: validated-loop-attached-edges-v22
flowchart TD
    n1(["Début"])
    n2(["Fin"])
    n3["x = 5"]
    %% pseudocode-edge e0 n1 n3 normal
    n1 e0@--> n3
    %% pseudocode-sequence e0 n1 n3
    n4{"x #62; 0 ?"}
    %% pseudocode-edge e1 n3 n4 normal
    n3 e1@--> n4
    %% pseudocode-sequence e1 n3 n4
    n5[/"Afficher 'positif'"/]
    %% pseudocode-edge e2 n4 n5 branch
    n4 e2@-->|"Oui"| n5
    n6[/"Afficher 'nul ou négatif'"/]
    %% pseudocode-edge e3 n4 n6 branch
    n4 e3@-->|"Non"| n6
    %% pseudocode-edge e4 n5 n2 normal
    n5 e4@--> n2
    %% pseudocode-sequence e4 n5 n2
    %% pseudocode-edge e5 n6 n2 normal
    n6 e5@--> n2
    %% pseudocode-sequence e5 n6 n2

pseudocoden1:s->n3:nn3:s->n4:nn4:s->n5:nOuin4:e->n6:nNonn5:s->n2:nn6:s->n2:nn1Débutn2Finn3x = 5n4x > 0 ?n5Afficher "positif"n6Afficher "nul ou négatif"

Boucle : Pour … de … à …

total = 0
Pour i de 1 à 5:
    total = total + i
Fin
Afficher total

%%{init: {"flowchart":{"curve":"basis","nodeSpacing":55,"rankSpacing":72,"htmlLabels":false},"layout":"elk","look":"classic","elk":{"preset":"modelOrder","nodePlacementStrategy":"LINEAR_SEGMENTS","nodePlacementAlignment":"NONE","layeringStrategy":"NETWORK_SIMPLEX","cycleBreakingStrategy":"MODEL_ORDER","considerModelOrder":"NODES_AND_EDGES","forceNodeModelOrder":true,"keepEntryNodeOnTop":true,"straightenEdges":true,"lineHops":false,"mergeEdges":false},"htmlLabels":false}}%%
%% pseudocode-layout-profile: validated-loop-attached-edges-v22
flowchart TD
    n1(["Début"])
    n2(["Fin"])
    n3["total = 0"]
    %% pseudocode-edge e0 n1 n3 normal
    n1 e0@--> n3
    %% pseudocode-sequence e0 n1 n3
    n4{"Pour i de 1 à 5"}
    %% pseudocode-edge e1 n3 n4 normal
    n3 e1@--> n4
    %% pseudocode-sequence e1 n3 n4
    subgraph loop1_body[" "]
        direction TB
    n5["total = total + i"]
    end
    style loop1_body fill:none,stroke:none
    %% pseudocode-edge e2 n4 n5 branch
    n4 e2@-->|"Oui"| n5
    %% pseudocode-loop-continue e2 n4 n5
    %% pseudocode-edge e3 n5 n4 loop_back
    n5 e3@-->|"(i = i + 1)"| n4
    %% pseudocode-loop-back e3 n5 n4
    n6[/"Afficher total"/]
    %% pseudocode-edge e4 n4 n6 branch
    n4 e4@-->|"Non"| n6
    %% pseudocode-loop-exit e4 n4 n6
    %% pseudocode-edge e5 n6 n2 normal
    n6 e5@--> n2
    %% pseudocode-sequence e5 n6 n2

pseudocoden1:s->n3:nn3:s->n4:nn4:s->n5:nOuin4:e->__exit_top_3:wNonn5:w->__return_bottom_1:e(i = i + 1)n6:s->n2:n__return_bottom_1:n->__return_top_2:s__return_top_2:e->n4:w__exit_top_3:s->__exit_bottom_4:n__exit_bottom_4:w->n6:en1Débutn2Finn3total = 0n4Pour i de 1 à 5n5total = total + in6Afficher total

Boucle : Pour … de … à … pas …

Pour i de 0 à 10 avec un pas de 2:
    Afficher i
Fin

%%{init: {"flowchart":{"curve":"basis","nodeSpacing":55,"rankSpacing":72,"htmlLabels":false},"layout":"elk","look":"classic","elk":{"preset":"modelOrder","nodePlacementStrategy":"LINEAR_SEGMENTS","nodePlacementAlignment":"NONE","layeringStrategy":"NETWORK_SIMPLEX","cycleBreakingStrategy":"MODEL_ORDER","considerModelOrder":"NODES_AND_EDGES","forceNodeModelOrder":true,"keepEntryNodeOnTop":true,"straightenEdges":true,"lineHops":false,"mergeEdges":false},"htmlLabels":false}}%%
%% pseudocode-layout-profile: validated-loop-attached-edges-v22
flowchart TD
    n1(["Début"])
    n2(["Fin"])
    n3{"Pour i de 0 à 10 avec un pas de 2"}
    %% pseudocode-edge e0 n1 n3 normal
    n1 e0@--> n3
    %% pseudocode-sequence e0 n1 n3
    subgraph loop1_body[" "]
        direction TB
    n4[/"Afficher i"/]
    end
    style loop1_body fill:none,stroke:none
    %% pseudocode-edge e1 n3 n4 branch
    n3 e1@-->|"Oui"| n4
    %% pseudocode-loop-continue e1 n3 n4
    %% pseudocode-edge e2 n4 n3 loop_back
    n4 e2@-->|"(i = i + 2)"| n3
    %% pseudocode-loop-back e2 n4 n3
    %% pseudocode-edge e3 n3 n2 branch
    n3 e3@-->|"Non"| n2
    %% pseudocode-loop-exit e3 n3 n2

pseudocoden1:s->n3:nn3:s->n4:nOuin3:e->__exit_top_3:wNonn4:w->__return_bottom_1:e(i = i + 2)__return_bottom_1:n->__return_top_2:s__return_top_2:e->n3:w__exit_top_3:s->__exit_bottom_4:n__exit_bottom_4:w->n2:en1Débutn2Finn3Pour i de 0 à 10 avec un pas de 2n4Afficher i

Boucle : Pour … Dans …

Pour c Dans "Bonjour":
    Afficher c
Fin

%%{init: {"flowchart":{"curve":"basis","nodeSpacing":55,"rankSpacing":72,"htmlLabels":false},"layout":"elk","look":"classic","elk":{"preset":"modelOrder","nodePlacementStrategy":"LINEAR_SEGMENTS","nodePlacementAlignment":"NONE","layeringStrategy":"NETWORK_SIMPLEX","cycleBreakingStrategy":"MODEL_ORDER","considerModelOrder":"NODES_AND_EDGES","forceNodeModelOrder":true,"keepEntryNodeOnTop":true,"straightenEdges":true,"lineHops":false,"mergeEdges":false},"htmlLabels":false}}%%
%% pseudocode-layout-profile: validated-loop-attached-edges-v22
flowchart TD
    n1(["Début"])
    n2(["Fin"])
    n3{"Pour c Dans 'Bonjour'"}
    %% pseudocode-edge e0 n1 n3 normal
    n1 e0@--> n3
    %% pseudocode-sequence e0 n1 n3
    subgraph loop1_body[" "]
        direction TB
    n4[/"Afficher c"/]
    end
    style loop1_body fill:none,stroke:none
    %% pseudocode-edge e1 n3 n4 branch
    n3 e1@-->|"Oui"| n4
    %% pseudocode-loop-continue e1 n3 n4
    %% pseudocode-edge e2 n4 n3 loop_back
    n4 e2@--> n3
    %% pseudocode-loop-back e2 n4 n3
    %% pseudocode-edge e3 n3 n2 branch
    n3 e3@-->|"Non"| n2
    %% pseudocode-loop-exit e3 n3 n2

pseudocoden1:s->n3:nn3:s->n4:nOuin3:e->__exit_top_3:wNonn4:w->__return_bottom_1:e__return_bottom_1:n->__return_top_2:s__return_top_2:e->n3:w__exit_top_3:s->__exit_bottom_4:n__exit_bottom_4:w->n2:en1Débutn2Finn3Pour c Dans "Bonjour"n4Afficher c

Boucle : Tant que …

i = 0
Tant Que i < 3:
    Afficher i
    i = i + 1
Fin

%%{init: {"flowchart":{"curve":"basis","nodeSpacing":55,"rankSpacing":72,"htmlLabels":false},"layout":"elk","look":"classic","elk":{"preset":"modelOrder","nodePlacementStrategy":"LINEAR_SEGMENTS","nodePlacementAlignment":"NONE","layeringStrategy":"NETWORK_SIMPLEX","cycleBreakingStrategy":"MODEL_ORDER","considerModelOrder":"NODES_AND_EDGES","forceNodeModelOrder":true,"keepEntryNodeOnTop":true,"straightenEdges":true,"lineHops":false,"mergeEdges":false},"htmlLabels":false}}%%
%% pseudocode-layout-profile: validated-loop-attached-edges-v22
flowchart TD
    n1(["Début"])
    n2(["Fin"])
    n3["i = 0"]
    %% pseudocode-edge e0 n1 n3 normal
    n1 e0@--> n3
    %% pseudocode-sequence e0 n1 n3
    n4{"Tant Que i #60; 3 ?"}
    %% pseudocode-edge e1 n3 n4 normal
    n3 e1@--> n4
    %% pseudocode-sequence e1 n3 n4
    subgraph loop1_body[" "]
        direction TB
    n5[/"Afficher i"/]
    n6["i = i + 1"]
    %% pseudocode-edge e2 n5 n6 normal
    n5 e2@--> n6
    %% pseudocode-sequence e2 n5 n6
    end
    style loop1_body fill:none,stroke:none
    %% pseudocode-edge e3 n4 n5 branch
    n4 e3@-->|"Oui"| n5
    %% pseudocode-loop-continue e3 n4 n5
    %% pseudocode-edge e4 n6 n4 loop_back
    n6 e4@--> n4
    %% pseudocode-loop-back e4 n6 n4
    %% pseudocode-edge e5 n4 n2 branch
    n4 e5@-->|"Non"| n2
    %% pseudocode-loop-exit e5 n4 n2

pseudocoden1:s->n3:nn3:s->n4:nn4:s->n5:nOuin4:e->__exit_top_3:wNonn5:s->n6:nn6:w->__return_bottom_1:e__return_bottom_1:n->__return_top_2:s__return_top_2:e->n4:w__exit_top_3:s->__exit_bottom_4:n__exit_bottom_4:w->n2:en1Débutn2Finn3i = 0n4Tant Que i < 3 ?n5Afficher in6i = i + 1

Boucle : Répéter … fois

Répéter 3 fois:
    Afficher "Bonjour"
Fin

%%{init: {"flowchart":{"curve":"basis","nodeSpacing":55,"rankSpacing":72,"htmlLabels":false},"layout":"elk","look":"classic","elk":{"preset":"modelOrder","nodePlacementStrategy":"LINEAR_SEGMENTS","nodePlacementAlignment":"NONE","layeringStrategy":"NETWORK_SIMPLEX","cycleBreakingStrategy":"MODEL_ORDER","considerModelOrder":"NODES_AND_EDGES","forceNodeModelOrder":true,"keepEntryNodeOnTop":true,"straightenEdges":true,"lineHops":false,"mergeEdges":false},"htmlLabels":false}}%%
%% pseudocode-layout-profile: validated-loop-attached-edges-v22
flowchart TD
    n1(["Début"])
    n2(["Fin"])
    n3{"Répéter 3 fois"}
    %% pseudocode-edge e0 n1 n3 normal
    n1 e0@--> n3
    %% pseudocode-sequence e0 n1 n3
    subgraph loop1_body[" "]
        direction TB
    n4[/"Afficher 'Bonjour'"/]
    end
    style loop1_body fill:none,stroke:none
    %% pseudocode-edge e1 n3 n4 branch
    n3 e1@-->|"Oui"| n4
    %% pseudocode-loop-continue e1 n3 n4
    %% pseudocode-edge e2 n4 n3 loop_back
    n4 e2@--> n3
    %% pseudocode-loop-back e2 n4 n3
    %% pseudocode-edge e3 n3 n2 branch
    n3 e3@-->|"Non"| n2
    %% pseudocode-loop-exit e3 n3 n2

pseudocoden1:s->n3:nn3:s->n4:nOuin3:e->__exit_top_3:wNonn4:w->__return_bottom_1:e__return_bottom_1:n->__return_top_2:s__return_top_2:e->n3:w__exit_top_3:s->__exit_bottom_4:n__exit_bottom_4:w->n2:en1Débutn2Finn3Répéter 3 foisn4Afficher "Bonjour"

Boucle : Répéter … jusqu'à …

i = 0
Répéter:
    Afficher i
    i = i + 1
Jusqu'à ce que i >= 3

%%{init: {"flowchart":{"curve":"basis","nodeSpacing":55,"rankSpacing":72,"htmlLabels":false},"layout":"elk","look":"classic","elk":{"preset":"modelOrder","nodePlacementStrategy":"LINEAR_SEGMENTS","nodePlacementAlignment":"NONE","layeringStrategy":"NETWORK_SIMPLEX","cycleBreakingStrategy":"MODEL_ORDER","considerModelOrder":"NODES_AND_EDGES","forceNodeModelOrder":true,"keepEntryNodeOnTop":true,"straightenEdges":true,"lineHops":false,"mergeEdges":false},"htmlLabels":false}}%%
%% pseudocode-layout-profile: validated-loop-attached-edges-v22
flowchart TD
    n1(["Début"])
    n2(["Fin"])
    n3["i = 0"]
    %% pseudocode-edge e0 n1 n3 normal
    n1 e0@--> n3
    %% pseudocode-sequence e0 n1 n3
    subgraph loop1[" "]
        direction TB
        subgraph loop1_body[" "]
            direction TB
    n4[/"Afficher i"/]
    n5["i = i + 1"]
    %% pseudocode-edge e1 n4 n5 normal
    n4 e1@--> n5
    %% pseudocode-sequence e1 n4 n5
        end
    style loop1_body fill:none,stroke:none
        subgraph loop1_condition[" "]
            direction TB
    n6{"i #62;= 3 ?"}
        end
    style loop1_condition fill:none,stroke:none
    %% pseudocode-edge e2 n5 n6 normal
    n5 e2@--> n6
    %% pseudocode-sequence e2 n5 n6
    end
    style loop1 fill:none,stroke:none
    %% pseudocode-edge e3 n3 n4 normal
    n3 e3@--> n4
    %% pseudocode-sequence e3 n3 n4
    %% pseudocode-edge e4 n6 n4 loop_back
    n6 e4@-->|"Non"| n4
    %% pseudocode-loop-back e4 n6 n4
    %% pseudocode-edge e5 n6 n2 branch
    n6 e5@-->|"Oui"| n2
    %% pseudocode-loop-exit e5 n6 n2

pseudocoden1:s->n3:nn3:s->n4:nn4:s->n5:nn5:s->n6:nn6:w->__return_bottom_1:eNonn6:e->__exit_top_3:wOui__return_bottom_1:n->__return_top_2:s__return_top_2:e->n4:w__exit_top_3:s->__exit_bottom_4:n__exit_bottom_4:w->n2:en1Débutn2Finn3i = 0n4Afficher in5i = i + 1n6i >= 3 ?