二维数组初始化

Question

i have created an two dimensional array like this:

char string_y2m[2][8];

Then I just used memset() for initialize it by 0:

memset(&string_y2m, 0, sizeof(string_y2m));

Now I have to assign it some value but it's not working. I have assigned it like this:

string_y2m[2][8] = {"2011-1","2011-01"};

It's not working, same thing if I do at declaration itself, it works.

Answer 1

You cannot assign strings like that in C, when the target is a character array and you're not also declaring it.

In C, you need to use strcpy() to copy the string into the array, paying a lot of attention to the buffer sizes:

strcpy(string_y2m[0], "2011-1");
strcpy(string_y2m[1], "2011-01");

Or use snprintf() if you have it:

snprintf(string_y2m[0], sizeof string_y2m[0], "%s", "2011-1");
snprintf(string_y2m[1], sizeof string_y2m[1], "%s", "2011-01");

Also, there's no need to clear the space before writing the string there, since writing the string will set the characters to the required values.

Answer 2

Just don't use assignment but initialize the array correctly from the start:

char string_y2m[2][8] = {"2011-1","2011-01"};

This will initialize all characters that are not initialized explicitly to 0 .