InterviewUp – Job Interview Questions and Answers – What is a macro, and how do you use it?

December 01, 2008

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What is a macro, and how do you use it?

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Asked By: tarun

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A macro is a preprocessor directive that provides a mechanism for token replacement in your source code. Macros are created by using the #define statement. Here is an example of a macro: Macros can also utilize special operators such as the stringizing operator (#) and the concatenation operator (##).The stringizing operator can be used to convert macro parameters to quoted strings, as in the following example: #define DEBUG_VALUE(v) printf(#v " is equal to %d.n", v)
In this program, we can check the value of a variable by invoking the DEBUG_VALUE macro: int x = 20; DEBUG_VALUE(x); The preceding code prints "x is equal to 20." on-screen. This example shows that the stringizing operator used with macros can be a very handy debugging tool.

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bbfromdc123

Saturday, November 29, 2008 11:53 AM

I know I know I know...

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What is a template?

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Asked By: chad03 |

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Sunday, April 27, 2008

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C++

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Computer Programmer

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Do you know how to use macro in Excel? Give me an example

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Asked By: ricky |

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Yes, I do. A macro is intended to help automate some of the redundant computations and processes by recording it under a macro name. An example would be a s series of formulas that you record and assign under one macro. All you need to do is to call on that macro when needed.

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Saturday, April 12, 2008

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application software, ms office, secretary

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Administrative Assistant, Administrative Secretary

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#define cat(x,y) x##y concatenates x to y. But cat(cat(1,2),3) does not expand but gives preprocessor warning. Why?

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Asked By: detech9 |

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#define cat(x,y) x##y concatenates x to y. But cat(cat(1,2),3) does not expand but gives preprocessor warning. Why?

in this case the cat(x,y) is the macro which is defined by using the preprocessor directive , this will be substituted only at the place where it is called in this example it happens like this

cat(1,2)##3 which will once again become 1##2##3
here if we use ## in between we can join or concatenat only two variables that why it gives a preprocessor warning

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Sunday, March 16, 2008

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embedded

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embedded systems

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Sunday, March 16, 2008 9:37 PM

is this really an interview question..?
why complicate ?

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Asked By: pradeep |

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Templates allow to create generic functions that admit any data type as parameters and return value without having to overload the function with all the possible data types. Until certain point they fulfill the functionality of a macro. Its prototype is any of the two following ones: template <class indetifier> function_declaration; template <typename indetifier> function_declaration;the only difference between both prototypes is the use of keyword class or typename, its use is indistinct since both expressions have exactly the same meaning and behave exactly the same way.

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Saturday, March 15, 2008

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template, C++

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c++

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