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题目内容 (请给出正确答案)
单选题
有以下程序 #include  void fun2(char a,char b) {  printf(%c %c,a,b); } char a='A',b='B'; void fun1() {  a='C';  b='D'; } main() {  fun1();  printf(%c %c ,a,b);   fun2('E','F'); } 程序的运行结果是(  )
A

C D E F

B

A B E F

C

A B C D

D

C D A B


参考答案

参考解析
解析:
调用fun1函数将全局变量a和b分别赋值为'C'和'D',然后输出全局变量a和b,最后调用fun2输出局部变量a和b的值,C语言规定,在同一源文件中,允许全局变量和局部变量同名,在局部变量作用域内,同名的全局变量不起作用,因此输出'E'和'F'。答案选择A选项。
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