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    <p>Your <code>scanf()</code> function needed to be edited<br> from <code>scanf("%s", &amp;response);</code><br> to <code>scanf("%s", response);</code>.<br> That will fix part of the problem. </p> <p>Since you do not want to use globals, why can you not put another argument in </p> <p><code>char *user_string(char *Setting_Type[], char *response_string)</code> ? </p> <p>You would have to allocate memory for it, and free it in the calling function (<code>main()</code>), but it would work in this scenario. (really should be providing some memory for it anyway, in its current usage) </p> <p><em><strong>Example:</em></strong> [Tested, works] </p> <pre><code>#include &lt;ansi_c.h&gt; #include &lt;stdio.h&gt; #include &lt;string.h&gt; char *user_string(char *Setting_Type[], char *s); int main() { char *response; char *test_names[2] = {"Test", "test"}; char *resp; resp = malloc(80);//I picked 80, you can pick something more appropriate response = malloc(80);//I picked 80, you can pick something more appropriate printf("Enter \"Test\" or \"test\": "); //user_string() returns a char *, so just call it in printf() printf("\nCorrect! Your input is: %s\n", user_string(test_names, response)); free(resp); free(response); return 0; } char *user_string(char *Setting_Type[], char *response_string) { int loop = 1; char response[10]; while(loop == 1) { scanf("%s", response); //removed &amp; strcpy(response_string,response);//changed from `=` to `strcpy()` if(strcmp(response_string, Setting_Type[0]) != 0 &amp;&amp; strcmp(response_string, Setting_Type[1]) != 0) printf("\nWrong! Please try again: "); else break; } return response_string; } </code></pre>
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    1. COThank you for that detailed response. I am just learning about malloc and don't quite understand it altogether. Doesn't the user's input only take in ten characters into response[10] and the rest goes to stdin?
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    2. COYou're welcome, thank you for accepting! In `user_string()`, response[10] can take _up to_ ***9*** chars from stdin, there has to be one left for the nul terminator '\0' `scanf()` brings in data from stdin, expecting it to conform to the format string, "%s" in this case, and will append '\0' to that input if it has room. A non-fatal warning "Attempt to write beyond string" occurs if you enter 10 (or more) chars, and a fatal error if you `strcpy()` what you have, into a pointer (such as response_string). Try it with this code, and use a break point in debug, so you can view the variables.
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