OJ Board

do you know the algorithm how to store a big number in an array of char
and then calculate it?

I know how to do it for addition and substraction but for multiplication I still can't find the right way.....

the number can be floating type

like : 1234.52

please help me with my problem here......

I know this is not the right way! But you can try.............

Use your addtion routine to make multiplication!

3 * 2 means:

3 + 3 or 2 + 2 + 2 isn't it?

Then ..............

(Actually you should use the process that we follow when doing multiplications in the paper with just a pen { not calculator }.............)

you can either look up some source code, or write your own! anywayz an eazy way to implement it is to figure out where the decimal places are, take them out, multiply them like integers and put them back in!

ok thanks a lot

then I can use a string then seperate it into a struct which has int decimal, int integer,int sign.

thanks for your help

I have to make a program that can calculate 5000 digits number

r.z. wrote:I know how to do it for addition and substraction but for multiplication I still can't find the right way.....

can you share the theory behind your way of doing it for addition and subtraction?

um, just add like normally how you would add