C langug

18 Write a program to enter a number from the keyboard, and If the entered number is positive, calculate the perimeter of a Trapezoid. Else, calculate the total surface area of a Trapezoid. Note-Perimeter-a+b+c+d; Total surface area=1/2(a+b)h. (All the inputs should be entered from keyboard). (4 Marks) ii) Draw the flowchart for the whole program. (2 Marks)