Thursday 12 September 2019

loops - Is it possible to exit a for before time in C++, if an ending condition is reached?



I want to know if it is possible to end a for loop in C++ when an ending condition (different from the reacheing right number of iterations) is verified. For instance:



for (int i = 0; i < maxi; ++i)
for (int j = 0; j < maxj; ++j)
// But if i == 4 < maxi AND j == 3 < maxj,

// then jump out of the two nested loops.


I know that this is possible in Perl with the next LABEL or last LABEL calls and labeled blocks, is it possible to do it in C++ or I should use a while loop?



Thank you.


Answer



You can use the return keyword: move the nested loop into a subroutine, invoke the subroutine to run the nested loops, and 'return' from the subroutine to exit [all] the loops.


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