Regarding reserve function in vector

#1

I want to ask that we use push_back function in vector to have doubling and we don’t use cin bcoz it can’t do doubling but if I reserve the vector of some size (let n) and try to input elements (let n-1 elements) in vector using cin , so cin also does not work there . WHY ?

#2

u can do it like this
image

#3

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#4

Can you give me a program as an example ?

#5

i didn’t get… what example do u need?