下列程序的运行结果是1,请将横线处缺失程序补充完整() class B; class A { friend class B; public: void Display() {cout< https://gw-c.nowcoder.com/api/sparta/jump/link?link=https%3A%2F%2Fwww.nowcoder.com%2FquestionTerminal%2Fa86629a0003148c79bd67f301641c959
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