C18 Error 1153 Cannot Assign Array Type Objects
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Passing And Returning Arrays In C
Download This Thread Subscribe to this Thread… Search Thread Advanced Search 16th November 2013,12:57 #1 ADGAN Full Member level 5 Join return int array in c Date Oct 2013 Posts 295 Helped 4 / 4 Points 1,696 Level 9 'cannot assign array type objects' error Hi! This is a part of my code which I'm writing in MPLAB C18. It gives the following a function can return a value of the type struct. error. Error [1153] cannot assign array type objects Error [1102] cannot assign to 'const' modified object Error [1131] type mismatch in assignment I don't know how to correct this error? Pls help. Code: char tnum[4],txt[]; void Zero_Fill(char *value) { // fill text representation if (value[1] == 0) { // with leading zero value[1] = value[0]; value[0] = 48; value[2] = 0; } } void rtrim(unsigned char* input){ while (*input != 0) input++; input--;
A List Has Two Items Associated With It: ____.
while (*input == ' '){ *input = 0; input--; } } btoa(day,tnum); txt = rtrim(tnum); Zero_Fill(txt); LCD_TextOut(3,7,txt); 16th November 2013,12:57 16th November 2013,14:57 #2 FvM Super Moderator Awards: Join Date Jan 2008 Location Bochum, Germany Posts 36,855 Helped 11318 / 11318 Points 215,755 Level 100 Re: 'cannot assign array type objects' error Is it asking too much if you show which code lines are causing the errrors? Obviously, a void function don't has a return value that could be assigned to a variable Code: txt = rtrim(tnum); A variable definition "char txt[];" doesn't make sense. It's not a pointer definition and it doesn't allocate storage. The construct name[] is only meaningful for initialized arrays, external declaration or formal function parameters. 16th November 2013,14:57 16th November 2013,15:01 #3 ADGAN Full Member level 5 Join Date Oct 2013 Posts 295 Helped 4 / 4 Points 1,696 Level 9 Re: 'cannot assign array type objects' error Sorry forgot to mention that. It is the 'txt = rtrim(tnum);' line that makes the error. 16th November 2013,15:01 16th November 2013,15:13 #4 FvM Super Moderator Awards: Join Date Jan 2008 Location Bochum, Germany Posts 36,855 Helped 11318 / 11318 Points 215,755 Level 100 Re: 'cannot assign array type objects' error So the answer has been already given.
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C Function Return String
Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Declaring a C function to return an array up vote 42 http://www.edaboard.com/thread303373.html down vote favorite 33 How can I make a function which returns an array? I tried this const int WIDTH=11; const int HEIGHT=11; int main() { char A[WIDTH][HEIGHT]; A=rand_grid(WIDTH,HEIGHT); return 0; } // Initializes a random board. char[][] rand_grid(int i, int k) { char* A[i][k]; for(j=0;jhttp://stackoverflow.com/questions/1453410/declaring-a-c-function-to-return-an-array int) time(0)); return(rand()%10); } c share|improve this question edited Mar 21 '10 at 10:36 Casebash 35.5k52168290 asked Sep 21 '09 at 8:26 Jaska 3151612 14 Don't call srand() more than once in your program: that will unnecessarily slow your program down and, most importantly, it will lower the randomness of the rand() function. –pmg Sep 21 '09 at 8:57 add a comment| 5 Answers 5 active oldest votes up vote 76 down vote accepted Several things to point out. First of all, you cannot assign an array object as you do here: char A[WIDTH][HEIGHT]; A=rand_grid(WIDTH,HEIGHT); Objects of array type are not modifiable. Secondly, functions in C cannot return array types. They can return pointers to arrays, though: char (*foo(int width))[HEIGHT] { /** * dynamically allocate memory for a widthxHEIGHT array of char */ char (*newArr)[HEIGHT] = malloc(sizeof *newArr * width); /** * initialize array contents here */ return newArr; } The syntax is a little confusing; it reads as foo -- foo foo(int width) -- is a function -- taking an int parameter *foo(int width) -- returning a pointer (*foo(int width))[HEIGHT] -- to a HEIGHT-element array char (*foo(int width))[HEIGHT] -- of char For C89, HEIGHT in the above snippet must be a compile-
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