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carraysinitializationcharmultidimensional-array
Travv92
Travv92

Reputation: 801

2D array - invalid initializer in C?

Hey guys I'm trying to initialize a 2D char array but am having trouble.

int size = 300 * 400;
char * frame[3] = malloc(sizeof(char *)*size*3);

Gives m: error: invalid initializer. So I tried:

int size = 300 * 400;
char frame[3][size] = malloc(sizeof(char *)*size*3);

But then I get error: variable-sized object may not be initialized?

Any ideas how I can initialize an array of size 300*400 with 3 rows?

Thanks.

Upvotes: 0

Views: 1264

Answers (1)

Kiril Kirov
Kiril Kirov

Reputation: 38173

You can try:

int size = 300 * 400;
const int rows_number = 3;
char* frame[ rows_number ]; // crate array with 3 elements, each of them `char*`
for( unsigned ii = 0; ii < rows_number; ++ii )
{
    // allocate `size` char`s for each "row"
    frame[ ii ] = malloc( sizeof(char) * size ); 
    // do not forget to free this memory later
}

Upvotes: 2

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