A program that will ask the user to give radius and then the program compute the area of the circle using a function in pascal programming language.
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Program Listing
program AreaOfCircle;
function CalculateArea(radius: Double): Double;
const
PI = 3.14159; // defining the value of pi
begin
CalculateArea := PI * radius * radius; // calculating the area of the circle
end;
var
radius, area: Double;
begin
writeln;
write('Area of a Circle Using Functions in Pascal');
writeln;
Write('Enter the radius of the circle: ');
ReadLn(radius);
// calling the function to calculate the area of the circle
area := CalculateArea(radius);
WriteLn('The area of the circle with radius ', radius:0:2, ' is ', area:0:2, '.');
writeln;
write('End of Program');
writeln;
end.
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