C++ track

C++ interview questions and answers

Panel-ready C++ interview set questions for freshers and experienced developers. Practice at Coding Cadre in Faridabad, or Online from Delhi NCR.

208 Qs
101 Easy OOP C++

What is inheritance used for?

Short take

Simple meaning

Sharing interfaces and behavior via base classes.

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102 Easy Memory C++

What does delete[] match?

Short take

Simple meaning

Memory allocated with new[].

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103 Easy Build C++

What is a translation unit?

Short take

Simple meaning

A single compiled .cpp after preprocessing.

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104 Moderate Modern C++

What is std::optional::and_then for?

Short take

Simple meaning

It chains computations only when a value exists, returning another optional.

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106 Moderate Modern C++

What does [[nodiscard]] do?

Short take

Simple meaning

It warns if a return value is ignored.

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107 Moderate STL C++

When do you use std::deque?

Short take

Simple meaning

When you need efficient push/pop at both ends.

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111 Moderate Concurrency C++

What does std::scoped_lock do?

Short take

Simple meaning

It locks multiple mutexes deadlock-avoidingly.

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114 Moderate Memory C++

What is double-free?

Short take

Simple meaning

Deleting the same block twice — undefined behavior.

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115 Moderate Memory C++

What does std::align do?

Short take

Simple meaning

It adjusts a pointer to an alignment boundary within a buffer.

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117 Moderate Build C++

What is unity build?

Short take

Simple meaning

Compiling many cpps as one translation unit to cut redundant parsing.

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120 Moderate Performance C++

What is false sharing?

Short take

Simple meaning

Threads invalidate each other’s cache lines by writing nearby memory.

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