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POstruct unable to define new type and structs within structs
 

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  1. POstruct unable to define new type and structs within structs
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    <p>I have the following C code.</p> <p>It is supposed to create a house type and a room type. However It seems the room type is not being recognised because I can't create functions of type room.</p> <p>After the code is the compiler error. </p> <pre><code>#include &lt;stdlib.h&gt; #include &lt;stdio.h&gt; //create type Room. struct Room { float width; float length; float height; char *name; }; //create type House. struct House { char *address; /*Rooms in house are an array of pointers. Each pointer to a Room.*/ struct Room *rooms[10]; }; //protype functions. void printHouse (struct House house); Room createRoom(char *name, float width, float length, float height); int main() { //create house h. struct House h; h.address = "10 Palace Road"; for (int i = 0; i &lt; 10; i++) h.rooms[i] = NULL; //create a room (hall) without use of createRoom. Successful. struct Room hall; hall.width = 10; hall.length = 12; hall.height = 9; hall.name = "Hall"; h.rooms[0] = &amp;hall; h.rooms[1] = &amp;createRoom("lounge", 20, 20, 9); printHouse(h); return 0; } Room createRoom(char *name, float width, float length, float height) { struct Room r; r.width = width; r.length = length; r.height = height; r.name = name; return r; } //prints contents of the house. Working okay. void printHouse (struct House house) { printf("%s",house.address); printf("\n\r\n\r"); for (int i=0; i&lt;10; i++) { if (house.rooms[i] != NULL) { struct Room r = *house.rooms[i]; printf("Room #%d: %s", i, r.name); } } } </code></pre> <p>I am getting the following, that I don't know how to fix, during compile. Could anyone tell me what to do here and tell me why Room is not being recognised as a type?. </p> <pre><code>gcc -std=c99 -c -Wall -ggdb -c -o struct.o struct.c struct.c:24:1: error: unknown type name ‘Room’ struct.c: In function ‘main’: struct.c:40:15: error: lvalue required as unary ‘&amp;’ operand struct.c: At top level: struct.c:49:1: error: unknown type name ‘Room’ struct.c: In function ‘createRoom’: struct.c:57:2: error: incompatible types when returning type ‘struct Room’ but ‘int’ was expected struct.c:58:1: warning: control reaches end of non-void function [-Wreturn-type] make: *** [struct.o] Error 1 </code></pre>
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    1. USurbanslug
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    1. COYou didn't even post the code in which the first error is present...
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    2. COReally? I posted everything apart from my makefile.
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      1. USurbanslug
    3. CO@urbanslug, just so you know, you can initialize a `struct` in a single declaration (almost like you would initialize an array).
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      1. UStay10r
 

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