Combination of characters and numbers

The calculator calculates the weighted average of the ratings of the following items.              

Converter allows you to convert numbers between number bases - binary (binary), trójkowym, czwórkowym, Friday, szóstkowym, siódemkowym, octal (octal), dziewiątkowym, decimal (decymalnym) jedenastkowym, dwunastkowym, trzynastkowym, czternastkowym, piętnastkowym, hexadecimal (hex). Typed characters that are not numbers and the letters A, B, C, D, E, F are ignored.      

Calculator by entering an angle in degrees or radians calculated values ​​of the basic trigonometric functions.

The program generates the prime numbers in a given range using the sieve of Eratosthenes algorithm.        

Calculator based on the entered numbers separated by commas calculate the harmonic mean.        

The calculator performs four basic operations with fractions ordinary. The result returns in the form of a fraction improper and nieskracalnego.