18. What is the expected output of the following program? Assume that fork is successful. Explain your answer. int main Cint argc, char *argvI) int pid = fork(); if (pid <0) fprintf(stderr, “error: fork failed.n) exit(1); } else if (pid-=0) { close (STDOUT FILENO) printf(“childn) else t printf(“parentn”); return 0; 19. In the following program, the child process calls waito. Assume that fork is successful. What is the output of the program? Explain your answer. int main
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