C++ Interview Questions and Answers

What is function overloading?

Function overloading or Function polymorphism is the ability to write more than one function with the same name, but the number or type of the parameters is different.

 

What is the difference between function overloading and overriding?

Overloading of Function called when more than one method created with the same name, but with a different signature (number and type of its Parameters). While in function overriding, method created in a derived class with the same name as a method in the base class and the same signature (number and type of its Parameters).

 

What is operator overloading?

Operator overloading is a mechanism that help to perform Operator operation on User defined data types like they operate on built-in data types, such as addition (+) and multiplication (*).

 

What is virtual function?

Runtime Polymorphism or dynamic binding mechanism is supported the use of virtual functions whereas pointers of base classes can keep derived class objects. Thus,
<base class>* baseObj = new <derived class>;

When derived class override base class virtual function then the override function call depend on contents (object pointed) of base class pointer that resolved at run time.

 

What is pure virtual functions?

A pure virtual member function is made by initializing it with zero in the base class and those must be override in derived classes.

virtual void speak () = 0;

What do you mean by inline function?

On calling the function, execution of the program jumps to calling function instructions, and when the function returns, execution jumps back to the next line in the calling function.It is some performance overhead in jumping in and out of functions.
When a function is declared with the keyword inline, the compiler does not create a real function: it copies the code from the inline function directly into the calling function. No jump is made; it is just as written the statements of the function right into the calling function.

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Pipes and Cistern

Two pipes A and B can fill a tank in 6 hours and 4 hours respectively. If they are opened on alternate hours and if pipe A s opened first, in how many hours, the tank shall be full?

A large tanker can be filled by two pipes A and B in 60 min and 40 min respectively. How many minutes will it take to fill the tanker from empty state if B is used for first half of the time, and A and B fill it together for the other half?

A tank is filled by 3 pipes with uniform flow. The first two pipes operating simultaneously fill the tank in the same time during which the tank is filled by the third pipe alone. The 2nd pipe fills the tank 5 hours faster than first pipe and 4 hours slower than third pipe. The time required by first pipe is?

Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill the cistern. How much time will be taken by A to fill the cistern separately?

Two pipes A and B can fill a tank in 24 min and 32 min respectively. If both the pipes are opened simultaneously, after how much time B should be closed so that the tank is full in 18 min?

Two pipes A and B can fill a tank in 36 min and 45 min respectively. A water pipe C can empty the tank in 30 min. First A and B are opened. after 7 min, C is also opened. In how much time, the tank is full?

Two pipes can fill a cistern in 14 hours and 16 hours respectively. The pipes are opened simultaneously and it is found that due to leakage in the bottom it took 32 min more to fill the cistern. When the cistern is full, in what time will the leak empty it?

Bucket P has thrice the capacity as Bucket Q. It takes 60 turns for Bucket P to fill the empty drum. How many turns it will take for both the buckets P and Q, having each turn together to fill the empty drum?

Probability

In a class , 30 % of the students offered English, 20 % offered Hindi and 10 % offered Both.If a student is offered at random, what is the probability that he has offered English or Hindi?

In a lottery ,there are 10 prizes and 25 blanks.A lottery is drawn at random. what is the probability of getting a prize ?

Two dice are thrown simultaneously .what is the probability of getting two numbers whose product is even?

Two diced are tossed the probability that the total score is a prime number?

Two cards are drawn at random from a pack of 52 cards What is the probability that either both are black or both are queens?

Two dice are thrown together .What is the probability that the sum of the number on the two faces is divisible by 4 or 6?

A bag contains 6 white and 4 black balls .Two balls are drawn at random .Find the probability that they are of the same colour?

In a simultaneous throw of a pair of dice,find the probability of getting a total more than 7?

An unbiased die is tossed.Find the probability of getting a multiple of 3?

Problems on Ages

My brother is 3 years elder to me. My father was 28 years of age when my sister was born while my mother was 26 years of age when i was born. If my sister was 4 years of age when my brother was born,then what was the age my father and mother respectively when my brother was born?

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