Initial commit: C++ courseware
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### 参考答案
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#### **一、 填空题**
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1. `/ 10`
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2. `45`
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3. `cstdio`
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4. `&`
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5. `double`
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6. `User ID: 99`
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7. `%.1f`
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8. `7`
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9. `1`
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10. `2`
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#### **二、 单项选择题**
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1. B
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2. C
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3. C
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4. B (整数除法,结果是2)
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5. B
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6. C
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7. B (`365/10` -> `36`, `36%10` -> `6`)
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8. B
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9. B
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10. B (`8/3` 商2余2)
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#### **三、 判断题**
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1. × (反了,`/` 是除法,`%` 是取余)
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2. √
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3. × (不安全,用户必须严格输入 `10,20` 才能被读取,不通用)
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4. √
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5. × (必须包含 `<cstdio>`)
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6. √
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7. × (可以同时输出多个,如 `printf("%d %d", a, b);`)
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8. √
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