Help with Simple Integer Expression

[wazzup]

My task is Create a program to read a simple integer expression and display the result. "Simple" means no parentheses are allowed and only the +, -, *, and / operators are allowed.

I think expression would be Multiplications , then Division, then Addition and Subtraction.

My program gave me a wrong result after addition, take a look to my code you will understand. Please help me to develop this.

Here is my Code

[DeMan]

Having looked at your code, I'm a little confused as to what you are trying to achieve....perh aps if you attached the output it is givving we might be able to work out what's going on

[wazzup]

Ok, First, This is my input as a string 12+34-34+11*4*11/11
Then, convert them to integer and calc them.

My program gave me result is -32
But Correct must be 56

My algorithm is get the string input then create an Array and put them into the Array. For ex input above: 12 is the first element and + is second elements of the array ...etc

Then I check the the Array if there is * then get the element before that time with elements after that. For ex input above: 11*4 . Then, get the result replace to position of * in array. Keep doing like that until no more *. Same thing with /, + and -

[wazzup]

This is my output of the program:

Original Input is 12 + 34 - 34 + 11 * 4 * 11 / 1
Input after trimmed is 12+34-34+11*4*11/11
Number elements of Array is 13
Original Values of Elements of the Array
A[0] = 12
A[1] = +
A[2] = 34
A[3] = -
A[4] = 34
A[5] = +
A[6] = 11
A[7] = *
A[8] = 4
A[9] = *
A[10] = 11
A[11] = /
A[12] = 11
 
Begin Calculate ...............
 
Expression: 11 * 4 = 44
Expression: 44 * 11 = 484
 
Values of Elements after Multiplications.
A[0] = 12
A[1] = +
A[2] = 34
A[3] = -
A[4] = 34
A[5] = +
A[6] =
A[7] =
A[8] =
A[9] = 484
A[10] =
A[11] = /
A[12] = 11
 
Expression: 484 / 11 = 44
 
Values of Elements after Divisions.
A[0] = 12
A[1] = +
A[2] = 34
A[3] = -
A[4] = 34
A[5] = +
A[6] =
A[7] =
A[8] =
A[9] =
A[10] =
A[11] = 44
A[12] =
 
Expression: 12 + 34 = 46
Expression: 34 + 44 = 78
 
Values of Elements after Additions.
A[0] =
A[1] = 46
A[2] =
A[3] = -
A[4] =
A[5] = 78
A[6] =
A[7] =
A[8] =
A[9] =
A[10] =
A[11] =
A[12] =
 
Expression: 46 - 78 = -32
 
Final Answer is -32
Correct answer is: 56
 

[wazzup]

I got it! Computer does the * and / first (left to right) then do the + and - (left to right). Thanks for the help!

[DeMan]

That was easy....