How to call external c++ program

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Hi,

I have to call an external executable program (prog2) from within my program (prog1) and then use the output of that exceutable program (prog2) in program (prog1) after calling it.

I have to manipulate the output obtained from progam (prog2) in program (prog1) and then perform this iteration n times.

I do not how to do this. Please let me know.

Thanks
 

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