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POwarning: format ‘%s’ expects type ‘char *’, but argument 2 has type ‘int’
 

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  1. POwarning: format ‘%s’ expects type ‘char *’, but argument 2 has type ‘int’
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    <p>I think this code and error is self-explanatory, but I don't know why?<br/><br/> Environment:<br/> OS: Mac OS X 10.6.1<br/> Compiler: i686-apple-darwin10-gcc-4.2.1<br/><br/> code:</p> <pre><code> 1 #include &lt;stdio.h&gt; 2 #include &lt;stdlib.h&gt; 3 #include &lt;netdb.h&gt; 4 #include &lt;sys/socket.h&gt; 5 6 int 7 main(int argc, char **argv) 8 { 9 char *ptr, **pptr; 10 struct hostent *hptr; 11 char str[32]; 12 13 //ptr = argv[1]; 14 ptr = "www.google.com"; 15 16 if ((hptr = gethostbyname(ptr)) == NULL) { 17 printf("gethostbyname error for host:%s\n", ptr); 18 19 } 20 printf("official hostname:%s\n", hptr-&gt;h_name); 21 22 for (pptr = hptr-&gt;h_aliases; *pptr != NULL; pptr++) 23 printf(" alias:%s\n", *pptr); 24 25 switch (hptr-&gt;h_addrtype) { 26 case AF_INET: 27 case AF_INET6: 28 pptr = hptr-&gt;h_addr_list; 29 30 for (; *pptr != NULL; pptr++) 31 printf(" address:%s\n", inet_ntop(hptr-&gt;h_addrtype, *pptr, str, sizeof(str))); 32 break; 33 default: 34 printf("unknown address type\n"); 35 break; 36 } 37 return 0; 38 } </code></pre> <p><br/> compiler and executed output below:</p> <pre><code>zhumatoMacBook:CProjects zhu$ gcc gethostbynamedemo.c gethostbynamedemo.c: In function ‘main’: gethostbynamedemo.c:31: warning: format ‘%s’ expects type ‘char *’, but argument 2 has type ‘int’ zhumatoMacBook:CProjects zhu$ ./a.out official hostname:www.l.google.com alias:www.google.com Segmentation fault </code></pre> <p>Why am I getting the format warning and could this be the cause of the segmentation fault?</p>
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