For your all informations ..... I'm a newbie in C programming ....

Can somebody help me to solve this problem ??


Write a calculator program that lets users enter a simple mathematic operation and display the results as in the sample output shown below (bold text indicates user input).

Calculate: 92 + 1
Result = Ninety Three

Calculate: 92, 000 + 1
Result = Ninety Two Thousand

Calculate: 92, 000.01 + 1
Result = Ninety Two Thousand and One Point Zero One

Calculate: 92, 000.01 * 1 + 1 / 1
Result = Ninety Two Thousand and One Point Zero One

our program MUST at least be able to interpret the following operators:
• +
• -
• /
• *
• %
• >
• <
• >=
• <=

The results should be in string and the 92,000 got comma one , a bit hard for me to solve it .....

Can solve it and discuss it here ?

the calculator part is quite easy, but you may have to input data on separate lines like:
92
+
1
you would have to use scanf() to recognise the numbers
and use a switch function for the sum like:
but the printing out as a string is more difficult
you could use a switch statement with the numbers 0-9 and their names to be used for each digit, but the output would be more like Zero Nine Three Point Zero Zero

To get a better out put you would have to make several switch statments, one for each digit.

So anybody can help me ??? I'm really dont know how to do the string part !!!! If use switch , is it we need 1000 cases ??

no you will need to do it like this:
If you did it the easy way you would have to do a while loop changing which digit you used each time

If you did it the hard way you would have to make 7 swich statements, one for each digit, plus a system for sorting out teens

Be patient. This is not a live board manned 24/7. The norm is that you will likely receive an answer within a day or so.

Now to answer your question, try to establish patterns. ie.

• 9 == nine.
• 90 == ninety.
• 900 == nine hundred.
• 9,000 == nine thousand.
• 90,000 == ninety thousand.
• etc.

Also consider:

• 99 == ninety-nine.
• 990 == nine hundred ninety.
• 9,900 == nine thousand nine hundred.
• etc.

So, to decompose 999,999,

• Note the position of the comma.
• Establish the longest sequence first: nine hundred thousand.
• Subtract what has already been determined & decompose the remainder: ninety-nine thousand.
• Because of the comma, consolidate the answer thus far: nine hundred ninety-nine thousand.
• Subtract & apply the same algorithm. Establish the longest pattern: nine hundred.
• Subtract, & find the next pattern: ninety.
• Subtract, & find the next pattern: nine.
• Subtract, & since the result is zero, build up what strings have been determined: nine hundred ninety-nine thousand nine hundred ninety-nine.

You now have enough enough of an algorithm which will allow you to extend it to millions, billions, etc.

You do not need 1000 cases. You should probably be able to convert it to a string first, then analyze each character. You will have to calculate the offset from the decimal character and decide whether it represents hundreds, tens, or ones. If the number is a 3 and it's in the tens spot then you know it is "thirty". After each 3 numbers, you'll need to decide whether the offset represents thousands, millions, billions, trillions, etc. (Can we assume a limit of 999.999999999999 trillion?) then append the proper word. So, for example, lets say the number is 1234567.89.

Calculate: 92, 000.01 * 1 + 1 / 1

If i do exactly what bobsam wrote , i cant have 3 variables for the calculation part ..... Is it cannot use switch ? or ?

And , thanks for your all ......You all are really nice ..... Really , thanks a lots !

The information provided to you thus far is only meant to get you started. bobsam's example was to illustrate how you might approach the problem is there were only two operands.
You need to clarify with your instructor how you are to deal with operator precedence. Typical arithmetic rules place multiplication & division higher than addition & subtraction.

For example, given the expression 2 + 3 * 4, the proper answer is 14. If operator precedence is relaxed, the answer may be 20.

You should also clarify whether parentheses are potential characters seen in the input stream.
I can only guess that this was mistyped. The actual answer is "ninety-two thousand one".
Although most people will use the word "and" when speaking the answer in English, the word "and" is not considered proper, & inserting this into your algorithm will unnecessarily make the work you need to complete harder. You should clarify with your instructor whether you are expected to insert the word "and" as well.

Oh ... then the correct way is still usong switch to do it ? Thanks for teaching me . And also thanks to Bobsam

A switch statement might be in order, but is only part of the solution. Before you invest too much more time, you need to resolve the questions on operator precedence. You need to talk to your instructor.