pop_0
pop_0(); /* pop only if the number was actually stored
pop_0(); /* pop only if the number was actually stored
pop_0(); /* pop only if the number was actually stored
pop_0(); /* pop only if the number was actually stored
pop_0(); /* pop only if the number was actually stored
pop_0(); /* pop only if the number was actually stored
pop_0(); /* pop only if the number was actually stored
pop_0(); /* pop only if the number was actually stored
pop_0(); /* pop only if the number was actually stored
pop_0(); /* pop only if the number was actually stored