## Missing Numbers Calculations Solving

## Answers to Questions

### How to solve a calculation with blank operators?

The resolution of calculation with blank is a common school puzzle consists of identifying the possible operations, for example, it is impossible to divide by 0. Also multiplications introduce large numbers, so they must be avoided if the result is small. Non-integer divisions are generally to be avoided.

Example: 1 ? 2 ? 3 = 0 has for solution 1 + 2 - 3 = 0

Example: (1 ? 2 ? 3) ? 4 = 0 has for solution (1 + 2 - 3) * 4 = 0

dCode also has a similar solver for numbers with missing digits.

### How does the missing numbers solver works?

The program handles the 4 operators (addition +, subtraction -, multiplication * and division /), the equal sign =, but also the upper and lower operators > and <.

The blanks should be replaced with ? (Question marks).

The solver uses a brute-force method, ie it tries all combinations and displays possible combinations.

The solver is limited to numbers and does not accept variables or letters in the calculation. Also, parentheses cannot be guessed and must be supplied.

## Source code

dCode retains ownership of the source code of the script Missing Operators Equation Solver online. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, Matlab, etc.) which dCode owns rights will not be given for free. To download the online Missing Operators Equation Solver script for offline use on PC, iPhone or Android, ask for price quote on contact page !