设有如下函数定义 #include int fun( int k ) { if (k<1) return 0; else if (k==1) return 1; else return fun(k-1)+1; } 若执行调用语句:n=fun(3);,则函数fun总共被调用的次数是 A. 3 B. 2 C. 4 D. 5
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