decrement

I'm trying to access and modify a variable of a thread in another thread in java, and I really don't know how to do this. ex : Runnable r1 = new Runnable() { int value = 10; public void run() { // random stuff } } Runnable r2 = new Runnable() { public void run() { // of course the bellow line will not work r1.value--; // I want here to be able to decrement the variable "value" of r1 } } Thread t1 = new Thread(r1); Thread t2 = new Thread(r2); t1.start(); t2.start(); thank you if you have any idea! Is there any way to create a getter and setter for a thread in java? EDIT : the answers were good,

(Note: I am not asking about the definitions of pre-increment vs. post-increment, or how they are used in C/C++. Therefore, I do not think this is a duplicate question.) Developers of C (Dennis Ritchie et al) created increment and decrement operators for very good reasons. What I don't understand is why they decided to create the distinction of pre- vs post- increments/decrements? My sense is that these operators were far more useful when C was being developed than today. Most C/C++ programmers use one or the other, and programmers from other languages find the distinction today bizarre and

I want to decrement a value when user delete it in php and mysql. I want to check not to go below than 0. If value is 0 then do not decrement . mysql_query("UPDATE table SET field = field - 1 WHERE id = $number"); If field is 0 then do not do anything Add another condition to update only if the field is greater 0 UPDATE table SET field = field - 1 WHERE id = $number and field > 0 You could prevent the new value to drop below zero by using GREATEST() . If the value drops below zero, zero will always be greater than your calculated value, thus preventing any value below zero to be used. UPDATE

This question already has an answer here: Loop backwards using indices in Python? 14 answers I want to have a for loop like so: for counter in range(10,0): print counter, and the output should be 10 9 8 7 6 5 4 3 2 1 user225312 a = " ".join(str(i) for i in range(10, 0, -1)) print (a) Check out the range documentation, you have to define a negative step: >>> range(10, 0, -1) [10, 9, 8, 7, 6, 5, 4, 3, 2, 1] You need to give the range a -1 step for i in range(10,0,-1): print i for i in range(10,0,-1): print i, The range() function will include the first value and exclude the second. range step

Looking at this question and trying out some of the code: int x = 100; while ( 0 <-------------------- x ) { printf("%d ", x); } I attempted to compile with gcc and got the following error: file.c: In function 'main': file:c:10:27: error: lvalue required as decrement operand while ( 0 <-------------------- x ) But compiling with g++ works. Why is this code valid in C++ but not C? In C, --x is a value, not an lvalue. Its effect is to decrement x , and evaluate to the newly assigned value of x . Since --x is not an lvalue, it cannot be decremented. In C++, --x is an lvalue, not an rvalue. Its