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carraysmultidimensional-arraymemset
mujahid
mujahid

Reputation: 701

how to use memset for double dimentional array?

I have a Double dim. array:

 alarm_1_active_buffer[MAX_NUM_ALARMS][MAX_ALARM_STRING_SIZE];

I want to clear the buffer before filling it.
Like this :

 for(index=0; index<MAX_NUM_ALARMS ; index++)
    {
        memset(&alarm_1_active_buffer[index], 0, MAX_ALARM_STRING_SIZE);
        memset(&alarm_1_active_buffer[index],string, MAX_ALARM_STRING_SIZE);
    }

It is not working.

Upvotes: 0

Views: 7498

Answers (2)

Conrad Meyer
Conrad Meyer

Reputation: 2886

Making sure to #include <string.h> first:

memset(alarm_1_active_buffer, 0, sizeof(alarm_1_active_buffer));

This method works regardless of the type of elements in the array.

Upvotes: 1

Asha
Asha

Reputation: 11232

Since the arrays are laid in continuos address spaces, you don't have to do anything special for 2d arrays. You can simply use memset(alarm_1_active_buffer, 0, MAX_NUM_ALARMS * MAX_ALARM_STRING_SIZE * sizeof(type of alarm_1_active_buffer));.

Upvotes: 1

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