while True: print("Select operation.") print("1.Add : + ") print("2.Subtract : - ") print("3.Multiply : * ") print("4.Divide : / ") print("5.Power : ^ ") print("6.Remainder: % ") print("7.Terminate: # ") print("8.Reset : $ ") choice = input("Enter choice(+,-,*,/,^,%,#,$): ") print(choice) if(select_op(choice) == -1): print("Done. Terminating") exit() def add(a,b): return a+b def subtract(a,b): return a-b def multiply (a,b): return a*b def divide(a,b): try: return a/b except Exception as e: print(e) def power(a,b): return a**b def remainder(a,b): return a%b history_list = list() def history(): if(len(history_list)==0): print("No past calculations to show") return 0 else: for history in history_list: print(history) return 0 def select_op(choice): if (choice == '#'): return -1 elif (choice == '$'): return 0 elif (choice == '?'): history() return 0 elif (choice in ('+','-','*','/','^','%')): while (True): num1s = str(input("Enter first number: ")) print(num1s) if num1s.endswith('$'): return 0 if num1s.endswith('#'): return -1 try: num1 = float(num1s) break except: print("Not a valid number,please enter again") continue while (True): num2s = str(input("Enter second number: ")) print(num2s) if num2s.endswith('$'): return 0 if num2s.endswith('#'): return -1 try: num2 = float(num2s) break except: print("Not a valid number,please enter again") continue result = 0.0 last_calculation = "" if choice == '+': result = add(num1, num2) elif choice == '-': result = subtract(num1, num2) elif choice == '*': result = multiply(num1, num2) elif choice == '/': result = divide(num1, num2) elif choice == '^': result = power(num1, num2) elif choice == '%': result = remainder(num1, num2) else: print("Something Went Wrong") last_calculation = "{0} {1} {2} = {3}".format(num1, choice, num2, result) print(last_calculation ) history_list.append(last_calculation) else: print("Unrecognized operation") while True: print("Select operation.") print("1.Add : + ") print("2.Subtract : - ") print("3.Multiply : * ") print("4.Divide : / ") print("5.Power : ^ ") print("6.Remainder: % ") print("7.Terminate: # ") print("8.Reset : $ ") print("8.History : ? ") # take input from the user choice = input("Enter choice(+,-,*,/,^,%,#,$,?): ") print(choice) if(select_op(choice) == -1): #program ends here print("Done. Terminating") exit() can you plz correct this with indentation ?
Control structures
Control structures are block of statements that analyze the value of variables and determine the flow of execution based on those values. When a program is running, the CPU executes the code line by line. After sometime, the program reaches the point where it has to make a decision on whether it has to go to another part of the code or repeat execution of certain part of the code. These results affect the flow of the program's code and these are called control structures.
Switch Statement
The switch statement is a key feature that is used by the programmers a lot in the world of programming and coding, as well as in information technology in general. The switch statement is a selection control mechanism that allows the variable value to change the order of the individual statements in the software execution via search.
while True:
print("Select operation.")
print("1.Add : + ")
print("2.Subtract : - ")
print("3.Multiply : * ")
print("4.Divide : / ")
print("5.Power : ^ ")
print("6.Remainder: % ")
print("7.Terminate: # ")
print("8.Reset : $ ")
choice = input("Enter choice(+,-,*,/,^,%,#,$): ")
print(choice)
if(select_op(choice) == -1):
print("Done. Terminating")
exit()
def add(a,b):
return a+b
def subtract(a,b):
return a-b
def multiply (a,b):
return a*b
def divide(a,b):
try:
return a/b
except Exception as e:
print(e)
def power(a,b):
return a**b
def remainder(a,b):
return a%b
history_list = list()
def history():
if(len(history_list)==0):
print("No past calculations to show")
return 0
else:
for history in history_list:
print(history)
return 0
def select_op(choice):
if (choice == '#'):
return -1
elif (choice == '$'):
return 0
elif (choice == '?'):
history()
return 0
elif (choice in ('+','-','*','/','^','%')):
while (True):
num1s = str(input("Enter first number: "))
print(num1s)
if num1s.endswith('$'):
return 0
if num1s.endswith('#'):
return -1
try:
num1 = float(num1s)
break
except:
print("Not a valid number,please enter again")
continue
while (True):
num2s = str(input("Enter second number: "))
print(num2s)
if num2s.endswith('$'):
return 0
if num2s.endswith('#'):
return -1
try:
num2 = float(num2s)
break
except:
print("Not a valid number,please enter again")
continue
result = 0.0
last_calculation = ""
if choice == '+':
result = add(num1, num2)
elif choice == '-':
result = subtract(num1, num2)
elif choice == '*':
result = multiply(num1, num2)
elif choice == '/':
result = divide(num1, num2)
elif choice == '^':
result = power(num1, num2)
elif choice == '%':
result = remainder(num1, num2)
else:
print("Something Went Wrong")
last_calculation = "{0} {1} {2} = {3}".format(num1, choice, num2, result)
print(last_calculation )
history_list.append(last_calculation)
else:
print("Unrecognized operation")
while True:
print("Select operation.")
print("1.Add : + ")
print("2.Subtract : - ")
print("3.Multiply : * ")
print("4.Divide : / ")
print("5.Power : ^ ")
print("6.Remainder: % ")
print("7.Terminate: # ")
print("8.Reset : $ ")
print("8.History : ? ")
# take input from the user
choice = input("Enter choice(+,-,*,/,^,%,#,$,?): ")
print(choice)
if(select_op(choice) == -1):
#program ends here
print("Done. Terminating")
exit()
can you plz correct this with indentation ?
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