You are understanding it correctly. You cannot use x to assign to in a nested scope in Python 2. In Python 3, you can still use it as a binding occurrence by marking the variable as nonlocal; this is a keyword introduced for just this usecase: def f(x): def g(n): nonlocal x if n < … Read more
First, I written a C code to generate sum: int main(){ int i =0, k =0, j =0, n =0; int N =0; int sum =0; N =10; for (n=1; n <= N; n++){ // unindented code here sum =0; for (i=1; i<=n; i++) for (j=1; j<=i; j++) for (k=1; k<=j; k++) sum++; printf(“\n N=%d … Read more
In the case of 2 nested loops: break 2; http://php.net/manual/en/control-structures.break.php
This limit not only applies to for loops, but to all other control flow blocks as well. The limit for the number of nested control flow blocks is defined inside of code.h with a constant named CO_MAXBLOCKS: #define CO_MAXBLOCKS 20 /* Max static block nesting within a function */ This constant is used to set … Read more
The best source of information is the official Python tutorial on list comprehensions. List comprehensions are nearly the same as for loops (certainly any list comprehension can be written as a for-loop) but they are often faster than using a for loop. Look at this longer list comprehension from the tutorial (the if part filters … Read more
No, don’t spoil the fun with a break. This is the last remaining valid use of goto 😉 If not this then you could use flags to break out of deep nested loops. Another approach to breaking out of a nested loop is to factor out both loops into a separate function, and return from … Read more
If you want to iterate over every item in the array as if it were a flattened array, you can just do: foreach (int i in array) { Console.Write(i); } which would print 123456 If you want to be able to know the x and y indexes as well, you’ll need to do: for (int … Read more
You should be able to break to a label, like so: function foo () { dance: for (var k = 0; k < 4; k++) { for (var m = 0; m < 4; m++) { if (m == 2) { break dance; } } } }
Just like Perl, loop1: for (var i in set1) { loop2: for (var j in set2) { loop3: for (var k in set3) { break loop2; // breaks out of loop3 and loop2 } } } as defined in EMCA-262 section 12.12. [MDN Docs] Unlike C, these labels can only be used for continue and … Read more
My first instinct would be to refactor the nested loop into a function and use return to break out.