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I have a simple temperature converter that takes user input in celsius and converts to Fahrenheit. 1) This is stored in a variable named tempcel. 2) Check if the tempcel has numbers in it by using the isdigit method. 3) Then the conversion formula is applied and answer is stored in another variable called tempfar. This is then printed.

However I noticed that i cannot input negative celsius temperatures in this - they are being treated as string and hence being prompted to enter again!

Trying to see how i can work this so that it should prevent users from entereing text and also take into account that someone can enter negative numbers. Can someone help? The code is given below . thanks..

tempcel = (input("please enter a temperature in Celcius : "))

while True:

    if (tempcel.isdigit()):

        tempcel = float(tempcel)
        tempfar = float((tempcel*9)/5 + 32)

        print("The temperature is ",tempfar, "degrees Fahrenheit.")

        if tempfar<=32:
            print("Whoa! Its freezing cold today!")

        elif tempfar<=50:    
            print("It is chilly today!")

        elif tempfar<=90:
            print("It is OK")

        else:
            print("Goddamn! Its hot today")

        break
    else:    
        print("Sorry you cannot enter a string of characters here. Please try again")

        tempcel = (input("please enter a temperature in Celcius :" ))

Your code in this case would also be vulnerable to failing if people enter 30.5 degrees which may not be desirable. A different way of handling this may be to use a try:... except:... clause as follows:

tempcel = (input("please enter a temperature in Celcius : "))

while True:

    try:
        tempcel = float(tempcel)
        tempfar = float((tempcel*9)/5 + 32)
        # the rest of the code you had before...

    except ValueError:    
        print("Sorry you cannot enter a string of characters here. Please try again")

        tempcel = (input("please enter a temperature in Celcius :" ))

This means that python will attempt to convert the input to a float but if it fails with a ValueError (unable to make the conversion), it will prompt the user again.

How to only allow negative numbers in Excel?, In the Data Validation dialog box, under the Settings tab, do the following options: code also can help you, with the following code, when you enter a positive number, A1:A1000 is the cells that you want to only input negative numbers input. and Print Paging Subtotals; Convert Between Cells Content and Comments. A 16-bit A/D converter has better resolution than an 8-bit A/D converter, since it is capable of representing a total of 65,536 amplitude levels, compared to 256 for the 8-bit converter. The resolution of an A/D converter is determined by the voltage range of the input analog signal divided by the numeric range (the possible number of amplitude

you could change the way you test if the string is a valid number :

check_string(input_string):
    try:
        return float(input_string)
    except ValueError:
        return None

How to Convert Negative Celsius to Fahrenheit, Also, at -40 degrees Celsius and Fahrenheit the temperatures match up. So, -40 Remember that a negative number multiplied by a positive number is a negative number. -10 x 1.8 = -18 To convert between Celsius and Fahrenheit you use a simple formula that takes this difference into account. Sale of Personal Data� In this program, you will learn about C++ program to convert temperature i.e degree Celsius into Fahrenheit and vice versa. Temperature conversion formula: F = ( 1.8 * C) + 32 //celsius into fahrenheit C = ( F - 32 ) / 32 //fahrenheit into celsius. Where, F = Temperature in Fahrenheit; C = Temperature in degree Celsius

The best approach is to add exception handling to catch if the conversion to a float fails. Also, there is no need to have two input() calls, it could be simplified as follows:

while True:
    tempcel = (input("please enter a temperature in Celcius : "))

    try:
        tempcel = float(tempcel)
        tempfar = (tempcel * 9.0) / 5.0 + 32.0

        print("The temperature is {:.1f} degrees Fahrenheit.".format(tempfar))

        if tempfar <= 32:
            print("Whoa! Its freezing cold today!")
        elif tempfar <= 50:    
            print("It is chilly today!")
        elif tempfar <= 90:
            print("It is OK")
        else:
            print("Goddamn! Its hot today")
        break
    except ValueError:
        print("Sorry you cannot enter a string of characters here. Please try again")

Also, there is no need to convert to float twice if you use floats in your calculation. The output can be be restricted to 1 decimal place by using format, e.g. {:.1f}.

Program Examples, If you want the user to enter data into the program, you can use the input() function. You will need to convert the variable number to an integer before performing a morning and it is raining THEN you will take a coat to school OTHERWISE you wont. You can also validate data by making sure it is within a certain range. multiplexed inputs and can also perform one-shot VREFN 3 3 Analog input Negative reference input DIN 17 23 Digital input(1)(2) Serial data input

How to calculate F or P values of thermal processes using Excel, Dr M Mullan explains how to use Excel to calculate F values of thermal Some DSFT spreadsheets also calculate the concentration of chemical Tref must be set to this temperature on the spreadsheet or On Line calculator. Most spreadsheets offer a range of data validation inputs for non-programmers, this facility can� The number validation is the same process except in the Validation window you select Text Length from the Allow field, Equal to from the Data field and type in the number 6 in the Length field. If you need the data to be in one cell then you can concatenate the cells.

Converting Number Into Written Out Words With Negative Numbers , I've gotten this working with positive numbers but cant find anywhere to get it to work when the number is a negative. Function SpellNumber(ByVal MyNumber) Dim Dollars, Cents, Temp, Negative Dim three sheets: A dashboard, a database, and a helper sheet for calculations, data validation lists, etc. Design a circuit that takes in 4-bit 2's complement number and outputs its negative number in 2's complement format. For +4, output is -4. I'm thinking of finding the logic using K-map but i'm not too sure whether it's the right way.

Program for decimal to hexadecimal conversion, Given a decimal number as input, we need to write a program to convert the the remainder when the number is divided by 16 in a temporary variable temp. Python input() function always convert the user input into a string. but how to check user input is a number. We can Convert string input to int or float type to check string input is an integer type. also using isdigit() method of string class we can check input string is number or string.

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