Fixed all the issues in the codes

addition.py

@@ -2,6 +2,6 @@
 num2 = int(input("Enter second number: "))
 
 # addition
-result = num1 * num2
+result = num1 + num2
 
 print("The sum of", num1, "and", num2, "is", result)

gcd.py

@@ -1,7 +1,13 @@
+def gcd(a, b):
+ if(b == 0):
+ return a
+ else:
+ return gcd(b, a % b)
+
 num1 = int(input("Enter first number: "))
 num2 = int(input("Enter second number: "))
 
 # greatest common divisor
-result = num1 + num2
 
-print("The GCD of", num1, "and", num2, "is", result)
+
+print("The GCD of", num1, "and", num2, "is", gcd(num1,num2))

simple_interest.py

@@ -3,6 +3,6 @@
 time = float(input("Enter the number of years for the investment: "))
 
 # Simple Interest Calculation
-interest = (principal * rate * time)
+interest = (principal * rate * time)/100
 
 print("The simple interest for an investment of", principal, "at", rate, "% for", time, "years is:", interest)