Is unsigned integer subtraction defined behavior?

I have come across code from someone who appears to believe there is a problem subtracting an unsigned integer from another integer of the same type when the result would be negative. So that code lik

How can I add numbers in a Bash script?

I have this Bash script and I had a problem in line 16. How can I take the previous result of line 15 and add

How do you store an arbitrarily large integer value in memory?

I have to store an integer value that is larg开发者_开发百科er than the maximum value for the long datatype. How would I store and manipulate this value in memory?

如图三角形abc是等边三角形bd是中线.....？