You create one Student instance, z, and call misc. setter member functions on that instance. When you then call the functions to print some of the values you've set, you forgot to tell the compiler which instance you want to print the values for. Since you only have one instance, z, add that before the member functions:
z.get_age();
z.to_string();
z.get_std();
Improvement suggestion: Functions that does not return a value but that prints the value would be better named print-something rather than get-something.
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您创建一个
Student实例z，并调用 Misc。该实例上的 setter 成员函数。然后，当您调用函数来打印您设置的某些值时，您忘记告诉编译器要打印哪个实例的值。由于您只有一个实例z，因此请在成员函数之前添加该实例：改进建议：不返回值但打印该值的函数最好命名为
print-something 而不是get-something。You create one
Studentinstance,z, and call misc. setter member functions on that instance. When you then call the functions to print some of the values you've set, you forgot to tell the compiler which instance you want to print the values for. Since you only have one instance,z, add that before the member functions:Improvement suggestion: Functions that does not return a value but that prints the value would be better named
print-something rather thanget-something.