Plz guys i have a problem in my c++ simple calculator,

I made everything great but i just need an important hint for my assignment that i can't figure it out.

for example when i add two numbers(2+4) the result is (6)...

i need the number (6) to be stored in order to complete for further calculations..

i need to store the result to maximize the calculations.

plz can someone help me with this problem???

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