C/C++ Interview Questions

• How do you decide which integer type to use?

• What should the 64-bit integer type on new, 64-bit machines be?

• What’s the best way to declare and define global variables?

• What does extern mean in a function declaration?

• What’s the auto keyword good for?

• I can’t seem to define a linked list node which contains a pointer to itself.

• How do I declare an array of N pointers to functions returning pointers to functions returning pointers to characters?

• How can I declare a function that returns a pointer to a function of its own type?

• My compiler is complaining about an invalid redeclaration of a function, but I only define it once and call it once. What’s happening?

• What can I safely assume about the initial values of variables which are not explicitly initialized?

  C QUESTIONS                 

• How do you write a program which produces its own source code as its output?

• How can I find the day of the week given the date?

• Why doesn’t C have nested functions?

• What is the most efficient way to count the number of bits which are set in a value?

• How can I convert integers to binary or hexadecimal?

• How can I call a function, given its name as a string?

• How do I access command-line arguments?

• How can I return multiple values from a function?

• How can I invoke another program from within a C program?

• How can I access memory located at a certain address?

• How can I allocate arrays or structures bigger than 64K?

• How can I find out how much memory is available?

• How can I read a directory in a C program?

• How can I increase the allowable number of simultaneously open files?

• What’s wrong with the call fopen(”c:\newdir\file.dat”, “r”)?