why my code is giving undeclared variable error?

by

apply is in scope in the for loop body, so be assured, the error is not there. But you are aware that apply is out of scope after the loop body?

I’m only answering this because your use of 

vector2.size() - 1

will give you hell if vector2 is empty, as the above will wrap around to a large unsigned value and your program will fail spectacularly! Use

for (int apply=0; apply + 1 < vector2.size(); apply++) {

instead.

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