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10s 256 MB
Exclusive Easy 1
Basics Microsoft

Implement a calculator that supports four basic operations:

Text 
add(a, b)      // Returns a + b
subtract(a, b) // Returns a - b
multiply(a, b) // Returns a * b
divide(a, b)   // Returns a / b (floating-point division, not integer division)

Important: All functions must handle both integers and floating-point numbers. If the result is a whole number, output it as an integer (e.g., 4 not 4.0). Otherwise, output the decimal value (e.g., 2.5).

Floating-point precision: Due to binary representation limitations, some decimal numbers cannot be stored exactly (e.g., 0.1, 5.1). When the mathematical result should be a clean decimal but floating-point arithmetic introduces small errors (e.g., 1.0999999999999996 instead of 1.1), round to a reasonable precision (10-12 decimal places) before outputting. If the rounded result is a whole number, output it as an integer.

  • First line: integer Q (number of queries)
  • Next Q lines: a [operator] b where a and b are numbers and [operator] is +, -, *, or /

Output Q numbers, one per line, representing the result of each query. Omit .0 from whole number results.

  • −109≤a,b≤109-10^9 \leq a, b \leq 10^9
  • 1≤Q≤1051 \leq Q \leq 10^5
  • The result will fit in a 32-bit signed integer
  • All inputs will fit within 5 digits of precision.
Example 1
Input 
4
6 + 7
6 + 7.2
5 - 4
5.1 - 4
Output 
13
13.2
1
1.1
Example 2
Input 
2
4.5 * 2
2.5 * 2.5
Output 
9
6.25
Example 3
Input 
2
5 / 2
4 / 2
Output 
2.5
2
Accepted 173/261
Acceptance 66%
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Input 
4
6 + 7
6 + 7.2
5 - 4
5.1 - 4
Expected Output 
13
13.2
1
1.1