2d strings and setting to null

If an array

Code:

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char firstName[5][20] = {' '};

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in the program you give firstName[0] = name by a scanf statement.

Now, I need to reset firstName [0][0] = all null.

How do I do this?

Code:

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firstName[index][0] = NULL;

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This is what I have right now. If I do a printf to check it it prints out as "NULL".

I m confused. sorry.

Um, lets see....
the string char firstName[5][20]={' '};
So every space in the string is null character.

through a scanf statement later on I give firstName[0][0] the name of Bob.

Now I need to bring the value of firstName[0][0] back to all null characters.

> Now I need to bring the value of firstName[0][0] back to all null characters.
All nul or just the first one?

firstName[0][0] = '\0';

so firstName[0] would look like, "\0ob\0 "

Is that what you're trying to achieve, or you want to set all of firstName[0] to nul, which could be:

Code:

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memset(firstName[0], '\0', sizeof(firstName[0]));

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Quote:

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Originally Posted by Fox101

Um, lets see....
the string

Code:

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char firstName[5][20]={' '};

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So every space in the string is null character.

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I am not very much sure about this but maybe you are right.

Quote:

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through a scanf statement later on I give firstName[0][0] the name of Bob.

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firstName[0][0] can hold only a single character. 'Bob' is three characters long.:confused:

Quote:

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Now I need to bring the value of firstName[0][0] back to all null characters.

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Code:

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firstName[0][0]='\0';

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