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单选

以下对C语言函数的有关描述,正确的是(6)。

  • A.在C中调用函数时,只有把实参的值传给形参,形参的值不能传给实参
  • B.C函数既可以嵌套定义又可以递归调用
  • C.函数必须有返回值,否则不能使用函数
  • D.C程序中有调用关系的所有函数必须放在同一个源程序文件中
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