$1$ void DL$($int len$)$

$2\{$

$3$int i;

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$4//$ doing my thing

$5$for $($i $=0$; i $<$ len; i$++)\{$

$6$Serial$.$print$(\text{'}-\text{'})$;

$7\}$

$8\}$

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a$)$ What does this function do$?$

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b$)$ What does the function return, if anything?

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c$)$ In Line $1,$ how does replacing int with byte affect what this function does?

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d$)$ What effect would placing $\text{'}$ with $"$ have on what the function does?