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fork compare to exec in linux c program

pid_t  pid=fork()
it has 3 situation for the return result pid
0  child
>0 parent process
<0 fork fail
fork create a new process  and it parent live alse when the child process had been created ......

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//----------------------------------------------------
//adder.c
//---------------------------------------------------
void adder(int a, int b, int *sum)
{
        *sum = a + b;
}
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