C++ MQCs with Explanation (CHAPTER 3: TOKENS, EXPRESSIONS AND CONTRAL STRUCTURES)

The following statements implement type cast operation. Which one of them is illegal?

1. x = y/(float)m;
2. x = y/float(m);
3. x = float(y)/(float)m;
4. x = y/float m;

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Answer: 

Option d: x = y/float m;

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Explanation Here