Lab 16

lab_16.py

@@ -0,0 +1,55 @@
+from math import sqrt
+
+print('\n\tWelcome to lab 16.')
+print('  Calculation of the triangle area.')
+
+while True:
+    try:
+        a = float(input('Enter the length of side "a"(positive): '))
+        if a <= 0:
+            raise ValueError('the value can not be negative!')
+        break
+    except ValueError as e:
+        print(f'The promlem is "{e}", please try again.')
+
+while True:
+    try:
+        b = float(input('Enter the length of side "b"(positive): '))
+        if b <= 0:
+            raise ValueError('the value can not be negative!')
+        break
+    except ValueError as e:
+        print(f'The promlem is "{e}", please try again.')
+
+while True:
+    try:
+        c = float(input('Enter the length of side "c"(positive): '))
+        if c <= 0:
+            raise ValueError('the value can not be negative!')
+        break
+    except ValueError as e:
+        print(f'The promlem is "{e}", please try again.')
+
+def check(a,b,c):
+    if (a+b)>c and (b+c)>a and (a+c)>b:
+        return True
+    else:
+        return False
+
+def triangle_ineq(func):
+    def inner(a,b,c):
+        if check(a,b,c)==True:
+            return func(a,b,c)        
+        else:
+            return 'You can`t make a triangle from these segments. The sum of two sides should exceed the third.'
+    return inner  
+
+@triangle_ineq
+def area_calculation(a, b, c):
+    p = (a + b + c) / 2
+    s = p * (p - a) * (p - b) * (p - c)
+    return f'S = {round(sqrt(s), 3)}'
+
+
+print(area_calculation(a, b, c))
+print('Done!\n')