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Tutur33
122 lines
4.7 KiB
HTML
122 lines
4.7 KiB
HTML
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<h1 id="topic_header_text">Exercice 3.6</h1>
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<a href="Lesbouclesinstructionsforwhile.html">Les boucles (instructions for, while)</a> ›› <a href="Exercices3.html">Exercices 3</a> ››
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<p></p>
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<p class="rvps7"><span class="rvts60">★★</span><span class="rvts49"> Code de César</span><br/><span class="rvts49">En cryptographie, le code de César est une technique de chiffrement élémentaire qui consiste à décaler une lettre de 3 rangs vers la droite :</span><br/><span class="rvts49">A → D</span><br/><span class="rvts49">B → E</span><br/><span class="rvts49">...</span><br/><span class="rvts49">Z → C</span></p>
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<p class="rvps7"><span class="rvts49"></span><br/><span class="rvts49">1) Ecrire le script de ce codage.</span><br/><span class="rvts49">Par exemple :</span></p>
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<p class="rvps8"><span class="rvts37">>>></span><br/><span class="rvts41">Message à coder ?</span><span class="rvts38"> abcdefghijklmnopqrstuvwxyz</span><br/><span class="rvts41">defghijklmnopqrstuvwxyzabc</span></p>
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<p class="rvps8"><span class="rvts37">>>></span><br/><span class="rvts41">Message à coder ?</span><span class="rvts38"> Monty Python's Flying Circus</span><br/><span class="rvts41">prqwb sbwkrq'v ioblqj flufxv</span></p>
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<p class="rvps7"><span class="rvts49">On pourra utiliser la chaîne </span><span class="rvts82">'</span><span class="rvts76">abcdefghijklmnopqrstuvwxyz</span><span class="rvts82">'</span><span class="rvts49"> et la méthode </span><span class="rvts76">find()</span><span class="rvts49"> de la classe </span><span class="rvts76">str</span><span class="rvts49">.</span><br/><span class="rvts49">Pour obtenir de l'aide sur cette méthode :</span></p>
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<p class="rvps8"><span class="rvts37">>>></span><span class="rvts38"> </span><span class="rvts40">help</span><span class="rvts38">(</span><span class="rvts40">str</span><span class="rvts38">.find)</span></p>
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<p class="rvps7"><span class="rvts49">2) Ecrire le script du décodage.</span><br/><span class="rvts49">Par exemple :</span></p>
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<p class="rvps8"><span class="rvts37">>>></span><br/><span class="rvts41">Message à décoder ?</span><span class="rvts38"> prqwb sbwkrq'v ioblqj flufxv</span><br/><span class="rvts41">monty python's flying circus</span></p>
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