int main()
{
printf("Program begins here!\n");
printParent();
pid_t pid1, pid2, pid3;
int a = 2, b = 2, c = 2, d = 2, e = 2, f = 2;
int result, rtval1, rtval2, rtval3;
pid1 = fork();
if(pid1 == 0)
{
printChild();
return add(a, b);
}
else
{
printf("I just finished forking pid1.\n");
waitpid(-1, &rtval1, 0);
rtval1 = WEXITSTATUS(rtval1);
printParent();
pid2 = fork();
if(pid2 == 0)
{
printChild();
return add(c, b);
}
else
{
printf("I just finished forking pid2.\n");
waitpid(-1, &rtval2, 0);
rtval2 = WEXITSTATUS(rtval2);
printParent();
pid3 = fork();
if(pid3 == 0)
{
printChild();
return divi(e, f);
}
else
{
printf("I just finished forking pid3.\n");
waitpid(-1, &rtval3, 0);
rtval3 = WEXITSTATUS(rtval3);
printParent();
}
}
}
result = (rtval1 * rtval2) - rtval3;
//printf("%d, %d, %d\n", rtval1, rtval2, rtval3); // debug
printf("The result of doing (%d + %d) * (%d + %d) - (%d / %d) is: %d\n", a, b, c, d, e, f, result);
return 0;
}
int main(int argc, char **argv)
{
const char *name = "input.txt";
if (argc == 2)
name = argv[1];
struct node *head = NULL;
FILE *file = fopen(name, "r");
if (file == 0)
{
fprintf(stderr, "%s: failed to open file %s for reading\n", argv[0], name);
return 1;
}
printf("File: %s\n", name);
int stdID, grade;
while (fscanf(file, "%d %d", &stdID, &grade) == 2)
{
if (stdID == -1 && grade == -1)
break;
printf("Read: %d %d\n", stdID, grade);
head = insertNode(head, stdID, grade);
//printf("Tree:\n");
//printTree(head);
}
fclose(file);
printf("Completed tree:\n");
printTree(head);
printf("\n");
printf("%3d %3d\n", head->ID, head->Grade);
printf("Parent tree:\n");
printParent(head);
printf("\n");
return 0;
}
