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Compiler design

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For the block-structured C code below, indicate the values assigned to w, x, y, and z.
int w, x, y, z;
int i = 3; int j = 4;
{
  int i = 5;
  w = i + j;
}
x = i + j;
{
  int j = 6;
  i = 7;
  y = i + j;
}
z = i + j;
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