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Objektinis programavimas C++ (BIO+INFO, egzaminas)

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Pretend you are a machine executing the code provided below, in the exact order that a machine would execute it. Assume the variables have the following values before starting: x = 1, y = 3. Track the use of the variable named y. Every time the variable is used as a left value (i.e. changed in memory), note (eg. write it on paper) the new value. Every time the variable is used as a right value (i.e. read from memory), note the (old) value. To provide an answer construct a string containing only digits and no spaces or other symbols, from the values you have written down, in that exact order.

for( ; 1; ) if (y < x++) break;

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Let myText be the name of a character array (char []) containing the contents of a text string "I hope that you are doing well".

Using the name myText, what expression would you write to access (represent, read of modify) the last letter 'o' in this current array?

Important: you do not need an expression to return a character in any string, just the expression to return the particular character in this particular string.

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Let str be a string. Write an expression that returns an index of the first occurrence (assume there is one) of "hello" in str.

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Pretend you are a machine executing the code provided below, in the exact order that a machine would execute it. Assume the variables have the following values before starting: x = 1, y = 3, z = 5. Track the use of the variable named z. Every time the variable is used as a left value (i.e. changed in memory), note (eg. write it on paper) the new value. Every time the variable is used as a right value (i.e. read from memory), note the (old) value. To provide an answer construct a string containing only digits and no spaces or other symbols, from the values you have written down, in that exact order.

while (x + 1 > 0) z = x--;

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Pretend you are a machine executing the code provided below, in the exact order that a machine would execute it. Assume the variables have the following values before starting: y = 3, z = 5. Track the use of the variable named z. Every time the variable is used as a left value (i.e. changed in memory), note (eg. write it on paper) the new value. Every time the variable is used as a right value (i.e. read from memory), note the (old) value. To provide an answer construct a string containing only digits and no spaces or other symbols, from the values you have written down, in that exact order.

for (i = z; i > y; --i) z = z + y - i;

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Assuming the definition of the class would be written in the form below ("..." means some code inside of the class, and brackets indicate the beginning and the ending), what could would you write to replace "?" if you were to define a class B that is a child of a class named C and a parent of class named A?

? { ... } // Java version

? { ... }; // C++ version

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What code would you write to declare a pointer/reference named p that can point to an object of the class named P, and would belong to an instance (as opposed to a class), and would not be accessible beyond the scope of the class?

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What code would you write to declare an abstract method called f that is public, accepts no arguments and does not return anything?

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What code would you write to declare a constant of type int named VALUE that would belong to the class (rather than an instance) and would be accessible to anyone using the class?

If required by the language, also initialize it to 0.