I'm trying to create a calculator that uses a text user interface. I have the interface writtern the way I want for now. Now I need help on writting the calculation code.
Would main() contain something like the code below?
Thank youCode:char operation; int quit = 0; while(!quit) { while(operation != '=') { getNumber(); getOperation(); } performCalculations(); }
More easy would be to let the user enter a string with an expression and analyse this expression. In your code for example, what if the user enters more than one number or more than one operator at a time?
Also you should initialise operation before using it.
One good way to make a command line calulator is to take in expressions in postfix notation ( because paranthesis are not require so it's a little simpler ).
Then all you have to do is make a stack.
and to evaluate the expression just ( in psuedocode),
this will work for expressions of any size in postfiz notation.Code:while(true){ x = read(); if(x == aNumber) stack.push(x) else if(x == anOperator) { y = stack.pop(); z = stack.pop(); result = (x=='*')?y * z: (x=='/')?y / z: (x=='+')?y + z: (x=='-')?y - z: y % z; stack.push(result); } }
If you want to use infix notation ( from the users point-of-view) you can convert the equation before you do this calulation.
The above code was meant to see if I had the right idea and I want a text interface for my calculator similar to the Windows calculator.
>>I want a text interface for my calculator similar to the Windows calculator.
Eh? The Windows calculator (calc.exe) is GUI based
When all else fails, read the instructions.
If you're posting code, use code tags: [code] /* insert code here */ [/code]
Yes, I know thats GUI based. if text isn't the right term than how about ASCII?
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