Skip to content

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 ›⁣ 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 ‹⁣ 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;

pseudocoden1Débutn2Finn3Saisir 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 !"n13Sortirn1: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:e

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 ›⁣ 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

pseudocoden1Débutn2Finn3x = 5n4x > 0 ?n5Afficher "positif"n6Afficher "nul ou négatif"n1:s->n3:nn3:s->n4:nn4:s->n5:nOuin4:e->n6:nNonn5:s->n2:nn6:s->n2:n

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

pseudocoden1Débutn2Finn3total = 0n4Pour i de 1 à 5n5total = total + in6Afficher totaln1: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:e

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

pseudocoden1Débutn2Finn3Pour i de 0 à 10 avec un pas de 2n4Afficher in1: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:e

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

pseudocoden1Débutn2Finn3Pour c Dans "Bonjour"n4Afficher cn1: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:e

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 ‹⁣ 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

pseudocoden1Débutn2Finn3i = 0n4Tant Que i < 3 ?n5Afficher in6i = i + 1n1: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:e

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

pseudocoden1Débutn2Finn3Répéter 3 foisn4Afficher "Bonjour"n1: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:e

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 ›⁣= 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

pseudocoden1Débutn2Finn3i = 0n4Afficher in5i = i + 1n6i >= 3 ?n1: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:e