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C Language > Learn C Language > How do you override a defined macro?
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How do you override a defined macro?

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Professional Tutor with 15 years of experience.

We can use the #ifdef and #undef directive to undefine a previously defined macro.
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C and linux Expert

You can use the #undef preprocessor directive to undefine (override) a previously defined macro. Many programmers like to ensure that their applications are using their own terms when defining symbols such as TRUE and FALSE.
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Computer & Maths Professor

You can use the #undef preprocessor directive to undefine (override) a previously defined macro.
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You can't. The command line is handled before any source and header files. If a source file defines a macro, then it must not be defined before, and will get the new value from now on. The only way to change it, is to #undef and #define it again, at a later point. If you have access to a header...
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You can't. The command line is handled before any source and header files. If a source file defines a macro, then it must not be defined before, and will get the new value from now on. The only way to change it, is to #undef and #define it again, at a later point. If you have access to a header that is included after the definition, then you have a chance. read less
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website and mobile application development training, digital marketing training

Yes, You can use the #undef preprocessor directive to undefine (override) a previously defined macro
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Tutor

You can use the #undef preprocessor directive to undefine (override) a previously defined macro.
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Thanks for your question Sharmistha.... By using #undef pre-processor directive we can override a defined macro. Thanks, Team DishaaPro, www.dishaapro.com
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#define MYMACRO(x) x*x //previously defined macro ... #ifdef MYMACRO #undef MYMACRO #define MYMACRO(x) x*x*x //new definition #endif int main() { printf("%d\n", MYMACRO(2)); return 0; }
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Science Expert, C & C++ Strong

You can use the #undef preprocessor directive to undefine (override) a previously defined macro. Many programmers like to ensure that their applications are using their own terms when defining symbols such as TRUE and FALSE. Your program can check to see whether these symbols have been defined already,...
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You can use the #undef preprocessor directive to undefine (override) a previously defined macro. Many programmers like to ensure that their applications are using their own terms when defining symbols such as TRUE and FALSE. Your program can check to see whether these symbols have been defined already, and if they have, you can override them with your own definitions of TRUE and FALSE. read less
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LearnHowToLearn, Expert In Programming Languages

Just redefine it.
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