Utiliser l'arithmétique du pointeur pour calculer la somme d'un tableau en C

Dans ce programme, nous devons utiliser l'arithmétique du pointeur pour trouver la somme des éléments du tableau.

Ici, nous utilisons * pour représenter la valeur stockée à l'adresse mémoire et l'adresse restera stockée dans la variable. Donc « int *ptr » signifie que ptr est une variable contenant une adresse dont le contenu est un entier.

*p signifie qu'il s'agit d'une variable de pointeur. En utilisant ceci et sum(), nous trouverons la somme des éléments du tableau.

Exemple de code

<span class="com">#include</span><span class="pln"> </span><span class="str"><stdio.h></span>
<span class="kwd">void</span><span class="pln"> s</span><span class="pun">(</span><span class="kwd">int</span><span class="pun">*</span><span class="pln"> a</span><span class="pun">,</span><span class="pln"> </span><span class="kwd">int</span><span class="pln"> len</span><span class="pun">) </span><span class="pun">{</span>
<span class="kwd">   int</span><span class="pln"> i</span><span class="pun">,</span><span class="pln"> s_of_arr </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span>
<span class="kwd">   for</span><span class="pln"> </span><span class="pun">(</span><span class="pln">i </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span><span class="pln"> i </span><span class="pun"><</span><span class="pln"> len</span><span class="pun">;</span><span class="pln"> i</span><span class="pun">++)</span>
<span class="pln">      s_of_arr </span><span class="pun">=</span><span class="pln"> s_of_arr </span><span class="pun">+</span><span class="pln"> </span><span class="pun">*(</span><span class="pln">a </span><span class="pun">+</span><span class="pln"> i</span><span class="pun">);</span>
<span class="pln">   printf</span><span class="pun">(</span><span class="pln"> </span><span class="str">"sum of array is = %d"</span><span class="pln"> </span><span class="pun">,</span><span class="pln">s_of_arr</span><span class="pun">);</span>
<span class="pun">}</span>
<span class="kwd">int</span><span class="pln"> main</span><span class="pun">() </span><span class="pun">{</span>
<span class="kwd">   int</span><span class="pln"> arr</span><span class="pun">[]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="lit">1</span><span class="pun">,</span><span class="lit">2</span><span class="pun">,</span><span class="lit">4</span><span class="pun">,</span><span class="lit">6</span><span class="pun">,</span><span class="lit">7</span><span class="pun">,-</span><span class="lit">5</span><span class="pun">,-</span><span class="lit">3</span><span class="pln"> </span><span class="pun">};</span>
<span class="pln">   s</span><span class="pun">(</span><span class="pln">arr</span><span class="pun">,</span><span class="pln"> </span><span class="lit">7</span><span class="pun">);</span>
<span class="kwd">   return</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span>
<span class="pun">}</span>

Sortie

Sum of array = 12

Algorithme

Begin
   Initialize array to hold the variables.
   Call function s to get the sum of the variables.
   Print the sum.
End.

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