C Programming and Technical Programming Output

whats the output of
main()
{
printf("%d",printf("%d",printf("%d",printf("%s","I Luv Program"))));}
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C Other Question

integer x = 40, y = 35, z = 20, w = 10;
Comment about the output of the following two statements:
print x * y / z - w
print x * y / (z - w)

1) Differ by 80
2) Same
3) Differ by 50
4) Differ by 160
int main()
{
int x=0xffff;
x=x<>3;
printf("%x",x);
}