# if function
x=int(input("enter a no."))
if x>0:
    print("%d is positive"%x)    
if x<0:
    print("%d is negative"%x)
if x==0:
    print("%d is zero"%x)

# if else function
x=int(input("enter a no."))
if x>0:                  #we also use paranthesis'()'
    print("%d is positive"%x)
else:
    print("%d is negative"%x)


# elif function
x=int(input("Enter a no."))
if x>0:
    print("no. is positive")
elif x<0:
    print("no. is negative")
else:
    print("no. is zero")
