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/* Compute the area of a selected shape in TINY.
Interaction:
- First, prompt for the shape type: enter one of "s", "c", "r", or "t"
for square, circle, rectangle, or triangle, respectively.
- Then, prompt only for the dimensions required for that shape.
- All dimensions must be integers > 0 (non-positive values are rejected).
- The program prints the area for the selected shape and exits.
*/
float area_square(float side) {
return side * side;
}
float area_circle(float radius) {
float pi := 3.141592653589793;
return pi * radius * radius;
}
float area_rectangle(float width, float height) {
return width * height;
}
float area_triangle(float base, float height) {
return 0.5 * base * height;
}
int main() {
string shape;
/* Prompt for shape type */
write "Enter shape (s=square, c=circle, r=rectangle, t=triangle): ";
read shape;
/* Square */
if shape = "s" then
int side;
write "Enter side (integer > 0): ";
read side;
if side <= 0 then
write "Error: side must be an integer > 0"; write endl;
return 1;
end
write "Square area: "; write area_square(side); write endl;
return 0;
end
/* Circle */
if shape = "c" then
int radius;
write "Enter radius (integer > 0): ";
read radius;
if radius <= 0 then
write "Error: radius must be an integer > 0"; write endl;
return 1;
end
write "Circle area: "; write area_circle(radius); write endl;
return 0;
end
/* Rectangle */
if shape = "r" then
int width;
int height;
write "Enter width (integer > 0): ";
read width;
if width <= 0 then
write "Error: width must be an integer > 0"; write endl;
return 1;
end
write "Enter height (integer > 0): ";
read height;
if height <= 0 then
write "Error: height must be an integer > 0"; write endl;
return 1;
end
write "Rectangle area: "; write area_rectangle(width, height); write endl;
return 0;
end
/* Triangle */
if shape = "t" then
int base;
int height;
write "Enter base (integer > 0): ";
read base;
if base <= 0 then
write "Error: base must be an integer > 0"; write endl;
return 1;
end
write "Enter height (integer > 0): ";
read height;
if height <= 0 then
write "Error: height must be an integer > 0"; write endl;
return 1;
end
write "Triangle area: "; write area_triangle(base, height); write endl;
return 0;
end
/* Unknown shape */
write "Error: unknown shape; enter one of s, c, r, t"; write endl;
return 1;
}
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