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POGlobal Array doesn't update while inside while loop?
 

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  1. POGlobal Array doesn't update while inside while loop?
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    <p>I have an array of structs, inside the while loop I add things to that array, however when I print out the array I get the wrong output? (The last element added is printed out n times, n being the number of things I added)</p> <p>I have googled this and I think it is because a while loop in Bash creates a subshell, not too sure.</p> <p>Any help would be much appreciated (please have patience I am only a student!!)</p> <p>Using Mac OSX mountain lion Xcode 4 gcc</p> <p>Code:</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;limits.h&gt; #include &lt;ctype.h&gt; #include &lt;stdlib.h&gt; #include &lt;string.h&gt; #include &lt;unistd.h&gt; #include &lt;sys/types.h&gt; typedef struct{ char* one; char* two; } Node; Node nodes[100]; int count = 0; void add(char *one,char*two){ Node newNode = {one,two}; nodes[count]= newNode; printf("one: %s\n",one); printf("two: %s\n",two); count++; } void print(){ int x; for (x = 0; x &lt; 10; x++) printf("%d : (%s, %s) \n",x,nodes[x].one, nodes[x].two); } void check(char **arg) { if(strcmp(*arg, "Add") == 0) add(arg[1],arg[2]); else if(strcmp(*arg,"print") == 0) print(); else printf("Error syntax Enter either: \n Add [item1][item2]\n OR \n print\n"); } void readandParseInput(char *line,char **arg) { if (fgets (line, 512, stdin)!= NULL) { char * pch; pch = strtok (line," \n\t"); int count = 0; arg[0] = pch; while (pch != NULL) { count++; pch = strtok (NULL, " \n\t"); arg[count] = pch; } }else{ printf("\n"); exit(0); } } int main() { int i; for(i = 0;i &lt;100; i++){ nodes[i].one = "."; nodes[i].two = "."; } char line[512]; /* the input line */ char *arg[50]; /* the command line argument */ while (1) { readandParseInput(line,arg); if(arg[0] != NULL) check(arg); } return(0); } </code></pre>
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    1. PO
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    1. USShahbaz
    1. USKevin Paton
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    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. COread up on malloc.
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      1. POGlobal Array doesn't update while inside while loop?
      1. USOren
    2. COIt would help you greatly if you properly indent your code.
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      1. POGlobal Array doesn't update while inside while loop?
      1. USShahbaz
    3. COThis is nothing to do with while loops in bash and subshells. Your `nodes` is an array of type `Node`, not `Node *`, so you can't do `Node newNode = {one,two}; nodes[count]= newNode;`.
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      1. POGlobal Array doesn't update while inside while loop?
      1. USVicky
 

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