试题与答案

以下叙述中正确的是______。A．调用 printf 函数时，必须要有输出项 B

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题型：单项选择题

题目：

以下叙述中正确的是______。

A．调用 printf 函数时，必须要有输出项

B．使用 putchar 函数时，必须在之前包含头文件 stdio.h

C．在 C 语言中，整数可以以十二进制、八进制或十六进制的形式输出

D．调用 getchar 函数读入字符时，可以从键盘上输入字符所对应的 ASCII 码

答案：

参考答案：B

解析：在使用标准输入输出库函数（除了 printf 和 scanf）前，必须要用预编译命令“#include”将头文件“stdio.h” 包括到用户源文件中。

考点：一级建造师C语言计算机二级(C)14
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