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dont use system() . If you want to hold the display screen, better use cin.get();

the way I suggested it, you wouldnt need an if-else block. Rather than user choosing which 2 to keep as is, let...

just tell the user to enter the element he wants to switch with the average ... lets say x(0/1/2)

then your lhs would become


a[x] = ....


You could work vectors the same way, if thats...

I guess he means something like:



#include <iostream>
#include <vector>



And nop that wouldnt be necessary, since its just 3(size fixed) values. You might as well use an array of size 3.