[Proj] To find a Map x Map y coordinate of lat, long value having projection system

[SIVA RAMA KRISHNA]

Hello,
I have a query related to conversion between lat long  to map x map y

I have a *lat ,lon *point with projection system and I wanted to know the*
map x map y *so that i can map on the map

I am working in c++

Any help in this context will be highly appreciated

Thanks in advance to all
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