Run two process at the same time in C/C++

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C++

C

Linux

i want to create one program in C/C++ that will run 2 process. This is my sample code

#include <stdio.h>
#include <stdlib.h>

main()
{
  system("Run process 1");
  system("Run process 2")
  return 0;
} 
;

But the problem is I have to wait the "process 1" to finish first before it can proceed with the second process ("process 2").

What is the best solution so it can run the "process 2" without waiting the "process1" to finish first.

Thanks