Computers and Technology, 23.10.2019 19:50, homelanie21

Display an introductory message: this program calculates the area of a triangle use the getdouble function to get the lengths (between 1 and 100) of the three sides from the user. this will require three calls to getdouble. use the calcarea function to get the area of the triangle. if calcarea returns a negative value for the area, then that indicates the triangle is invalid. if the triangle is invalid, then display an error message; otherwise display the area with one digit after the decimal point.

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Display an introductory message: this program calculates the area of a triangle use the getdouble f...