( Example 8. Temperature Conversion ) \ Converting temperature readings between Celcius and Farenheit \ is also an interesting problem. The difference between temperature \ conversion and money exchange is that the two temperature scales \ have an offset besides the scaling factor. \ In the following examples, we use these Forth arithmatic operators: \ + [ n1 n2 -- n1+n2 ] Add n1 and n2 and leave sum on stack. \ - [ n1 n2 -- n1-n2 ] Subtract n2 from n1 and leave differrence \ on stack. \ * [ n1 n2 -- n1*n2 ] Multiply n1 and n2 and leave product \ on stack. \ / [ n1 n2 -- n1/n2 ] Divide n1 by n2 and leave quotient on \ stack. \ */ [ n1 n2 n3 -- n1*n2/n3] Multiply n1 and n2, divide the product \ by n3 and leave quotient on the stack. : F>C ( nFarenheit -- nCelcius ) 32 - 10 18 */ ; : C>F ( nCelcius -- nFarenheit ) 18 10 */ 32 + ; \ Try these commands \ 90 F>C . shows the temperature in a hot summer day and \ 0 C>F . shows the temperature in a cold winter night. flush