(1. Find the return value of the following function (Microsoft) intfunc(x){intcountx=0;while(x){countx ;x=x(x-1);}returncountx;} Assume x=9999. Answer: 8 Ideas: Convert x to binary and see the number of rich 1s. 2. What is a "citation"? What should be paid attention to when declaring and using a "citation"? Answer: A reference is the "alias" of a program variable, and the operation of using it is exactly the same as the direct operation of the variable. When declaring a reference, remember to initialize it. After the citation statement is over, the program variable name has two titles, namely the program's original title and the citation name. The citation name can no longer be used as an alias for other variable names. Declaring a citation does not define a new variable, it only indicates that the citation name is an alias of the program variable name, and it is not a data type itself, so the citation itself does not occupy a storage unit, and the system does not allocate a storage unit to the citation. . Cannot create a reference to an array. 3. What are the characteristics of using "reference" as a function parameter? (1) The function of passing a reference to a function is the same as passing a pointer. At this time, the formal parameter of the called function becomes an alias of the actual parameter variable or scheme in the original calling function, so the operation of the formal parameter variable in the called function is the corresponding scheme scheme. The operation (in the calling function). ......
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