(Practice) Just as the keyword int can be used to signify that a function returns an integer, the keywords void, char, float, and double can be used to signify that a function returns no value, a character, a floating-point number, and a double-precision number, respectively. Using this information, write header lines for a function named abs() that receives no arguments but returns the following:
a. No value
b. A character
c. A floating-point number
d. A double-precision number
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