Explain the difference between "call by value" and "call by refer_英语解答

Explain the difference between "call by value" and "call by reference" in a programming language.How do these apply to the C language?

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解答

按值传递参数：参数的值会被复制一份,在被调用函数内对参数做的赋值操作对调用函数来说是不可见的.
按引用传递,在C语言中一般以指针参数体现.对指针指向区域所作的修改对调用函数是可见的.