Tool/solver to resolve cryptarithms, a numeric puzzle which consists in a mathematical calculation in which letters have been replaced by digits to find.

Cryptarithm Solver - dCode

Tag(s) : Number Games, Arithmetics

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To get more results associating several numbers with the same letter or several letters with the same number, replace the letters by '?' (question mark) and use the fill-the-blank solver:

⮞ Go to: Missing Numbers Calculator

dCode has an equation solver to solve calculations with unknowns:

⮞ Go to: Equation Solver

A cryptarithm (or *alphametic*, or *cryptarithmetics*) a mathematical game representing an arithmetic equation (with an equals sign `=`) in which one or more numbers are replaced by a substitution of letters or symbols. The objective of the game is to find which numbers correspond to which letter so that the equation is correct.

__Example:__ `DONALD + GERALD = ROBERT`

`BASE + BALL = GAMES`

`LLP + LINEAR + LOGIC = PROLOG`

`LOGIC + LOGIC = PROLOG`

`CROSS + ROADS = DANGER`

`SATURN + URANUS = PLANETS`

`ABC + ABC + ABC = BBB`

`AB + BC + CA = ABC`

`XX + YY + ZZ = XYZ`

`XXXX + YYYY + ZZZZ = YXXXZ`

`XXXX + YYYY + ZZZZ = XYYYZ`

Cryptarithm solving involves deduction and use of calculation tricks.

Method 1 (automatic): use the above solver, it tries all possible digits for all letters (brute-force method).

Method 2 (manual): deduction, logic and principles of mathematical calculations according to a few rules:

— Each letter can be associated to only one digit (appropriate numeral from 0 to 9). and reciprocally each digit can be associated to only one letter

If your calculation do not follow this rule, then use the missing numbers solver.

— Numbers usually do not start with a zero `0`

The resolution then goes through the search for particular cases:

— addition/subtraction with `0` or `9`

__Example:__ `??A+??A=??A` then `A` is `0`

__Example:__ `?A?+?A?=?A?` then `A` is `0` or `9`, same for `?A?+?B?=?B?` or `??A+??B=??B`

— first digits and last digits

__Example:__ `???+???=A???` then `A` is `1` because it is impossible that the sum of 2 numbers less than 1000 is superior to 1999.

— multiplications by 0, 1 or 5 and squaring

__Example:__ `A*A=?B` then `A` is not `0`, `1` or `5`

— multiplications of numbers with n and m digits that create numbers with n + m digits

— divisions by 1 ou 5

Do not hesitate to make attempts when there are few possibilities

The cryptarithm solver handles classic mathematical operators like addition `+` (plus), subtraction `-` (minus), multiplication `*` (times) and division `/`.

The solver takes as unknowns between 1 and 10 distinct letters A-Z (which will represent the numbers 0 to 9).

__Example:__ `DCODE+CODING=SOLVED` => `92095+209764=301859`.

The solver also handles the logical conditions `&&` for AND, `||` for OR and the upper and lower operators `>` and `<`. Additional criteria/conditions can be written with `&&`.

__Example:__ To solve `ABC+BCD=DEF` knowing that `B` is less than `C` and `F` has the value `6`. Write: `ABC + BCD = DEF && B < C && F = 6` which resolves to `537+379 = 916`

The cryptarithm solver uses a brute-force method: it tries all combinations of numbers and displays the possible ones. He does not provide a detailed explanation of his reasoning.

Some cryptarithms arrive in the form:

AB

×C

--------

DE

+FG

---------

HI

Please rewrite it in 2 parts `AB*C=DE+FG && DE+FG=HI` for the solver

Yes, some cryptarithms can have multiple valid solutions, but many are designed to have only one.

It is the most known example of cryptarithm, published in 1924 in Strand Magazine, by Henry Dudeney: `SEND+MORE=MONEY`. Solution is O=0, M=1, Y=2, E=5, N=6, D=7, R=8, and S=9.

dCode retains ownership of the "Cryptarithm Solver" source code. Except explicit open source licence (indicated Creative Commons / free), the "Cryptarithm Solver" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or the "Cryptarithm Solver" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "Cryptarithm Solver" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app!

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Cite as source (bibliography):

*Cryptarithm Solver* on dCode.fr [online website], retrieved on 2024-05-27,

cryptarithm,cryptarithmetic,alphametic,equation,calculation,letter,digit,addition,multiplication,plus,minus,equal,puzzle,send,more,money,substitution

https://www.dcode.fr/cryptarithm-solver

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