integer array initialization error in C

Question

I'm trying to initialize my array in the following way but get an expression syntax error:

int LineOne[ARRAY_LENGTH];//where ARRAY_LENGTH is a constant of length 10
if(SOME_CONDITION_IS_TRUE){
LineOne[ARRAY_LENGTH] = {0,1,0,0,1,1,1,0,1,1};
}

Johan Kotlinski · Accepted Answer · 2012-12-02 11:26:00Z

1

It really depends on the rest of the code (how you want to use the array), what solution is the best. One other way to do it could be...

int* LineOne = 0;
if(SOME_CONDITION_IS_TRUE) {
    static int* init = {0,1,0,0,1,1,1,0,1,1};
    LineOne = init;
}

answered Dec 2, 2012 at 11:26

Johan Kotlinski

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Comments

unwind · Accepted Answer · 2012-12-02 11:19:38Z

1

You cannot have array literals in "classic" C, except as initializers when the variable is being defined.

In C99, you can use compound literals to do this, but you must repeat the type in a cast-like expression before the literal:

LineOne = (int[ARRAY_LENGTH]) { 0,1,0,0,1,1,1,0,1,1 };

answered Dec 2, 2012 at 11:19

unwind

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4 Comments

Hasham Rasheed Over a year ago

any other way I can initialize the array like above?

user529758 Over a year ago

@user1870194 memset(), memcpy(), etc. or manual one-by-one initialization. Sorry, but much data is much.

Mario Over a year ago

Just keep in mind that using direct memory access is prone to byte order issues when porting to other platforms.

Hasham Rasheed Over a year ago

thanks a million people :) i think @kotlinski answered my question

kmkaplan · Accepted Answer · 2012-12-02 11:21:10Z

0

You can not do it that way. You could use an alternate array and copy it:

#include <string.h>
…
int values[] = {0,1,0,0,1,1,1,0,1,1};

int LineOne[ARRAY_LENGTH];//where ARRAY_LENGHT is a constant of length 10
if(SOME_CONDITION_IS_TRUE)
    memcpy(LineOne, values, sizeof(values));

answered Dec 2, 2012 at 11:21

kmkaplan

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3 Comments

kmkaplan Over a year ago

@carlosdc No. sizeof(values) is the numbr of bytes of the whole values array.

Hasham Rasheed Over a year ago

the values {0,1,0,0,1,1,1,0,1,1} are dynamically changing values based on a condition and this is the reason why I want to initialize LineOne[ArrayLength] later in the code. Any other way? Right now what I'm doing is:codeif(SOME_CONDITION){LineOne[i] = 1; i++; LineOne[i] = 0; i++; LineOne[i] = 1; i++; LineOne[i] = 1; i++; LineOne[i] = 1; i++; LineOne[i] = 1; i++; LineOne[i] = 1; i++; LineOne[i] = 0; i++; LineOne[i] = 0; i++; LineOne[i] = 1;}code

kmkaplan Over a year ago

@user1870194 it is very dependant on how you acquire the values {0,1,0,0,1,1,1,0,1,1}. If they are in an array then you can memcpy the array. Otherwise chances are you will have to make element by element assignement. Note that not using i as an index but an actual literal (0, etc.) is easier.

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