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下面程序從一個二進(jìn)制文件中讀人結(jié)構(gòu)體數(shù)據(jù)，并把結(jié)構(gòu)體數(shù)據(jù)顯示在終端屏幕上，請?zhí)羁铡?include st

ruct rec { int num； float total； }； reout(_________) {struct rec r； while(!feof(f)) {fread(＆r，________，1，f)； printf(“％d，％f＼n”，____________)； } ) main() {FILE *f； f=fopen(“bin．dat”，“rb”)； reout(f)； fclose(f)； )

參考答案：在提供的代碼中，需要填空的部分如下： 1. 在 `reout` 函數(shù)聲明中，需要填入?yún)?shù)類型，以便函數(shù)可以接收一個文件指針。因此，第一個空應(yīng)填入 `FILE *f`。 2. 在 `fread` 函數(shù)調(diào)用中，需要填入讀取的字節(jié)數(shù)。由于 `struct rec` 包含一個 `int` 和一個 `float`，其總大小取決于編譯器和平臺，但通常 `int` 和 `float` 分別為 4 字節(jié)，所以結(jié)構(gòu)體大小為 8 字節(jié)。因此，第二個空應(yīng)填入 `sizeof(struct rec)`。 3. 在 `printf` 函數(shù)調(diào)用中，需要填入格式化字符串，以便正確顯示結(jié)構(gòu)體中的 `num` 和 `total` 成員。因此，第三個空應(yīng)填入 `"%d, %f\n"`。完整的代碼如下： ```c #include struct rec { int num; float total; }; void reout(FILE *f) { struct rec r; while (!feof(f)) { fread(&r, sizeof(struct rec), 1, f); printf("%d, %f\n", r.num, r.total); } } int main() { FILE *f; f = fopen("bin.dat", "rb"); if (f == NULL) { perror("Error opening file"); return 1; } reout(f); fclose(f); return 0; } ``` 注意：在實際使用中，應(yīng)該檢查 `fopen` 的返回值以確保文件成功打開，并且在讀取文件時應(yīng)該檢查 `fread` 的返回值以確保數(shù)據(jù)正確讀取。如果 `fread` 返回的不是 1，那么可能讀取失敗或者到達(dá)了文件末尾。此外，`fclose` 應(yīng)該在 `fopen` 成功后調(diào)用，否則應(yīng)該處理錯誤情況。

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There is a letter about reference sales.

Dear Sir:
How would you like to increase the efficiency of your office staff by 10% this summer？
Tests in over 80 business offices using Glux air conditioners have proved that staff efficiency in these offices increased by 10% after the Glux was installed. As the increased staff efficiency means greater profits, you will therefore get back your cost within a limited period of time.
The price of the air conditioner is very competitive, 5% lower than that of similar products in the market. If you would like to spread the cost, you have two years to pay up. In addition, improvements in the new model will also make your operating costs low.
Won't you call and ask us to send you our technical personnel to identify your specific needs and do the installation？ Each day's delay costs you money.
Yours Faithfully,
Tony Smith
Chief seller
What is the purpose of the letter？
To sale ______.

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