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in this video were going to learn about the if defined and if not defined preprocessor directives in c so these directives are used for conditional compilation we can include or not include pieces of code in our source code based on whether or not some macro has been defined or not defined you might be familiar with the preprocessor from using the define statement to create constants so for example if we say number to find buffer size 100 so define here is whats called a preprocessor directive and were using it to define a macro called buffer size when our program is compiled theres going to be a text substitution operation thats going to take place in the first phase of the compilation of our program called the pre-processing phase any occurrence of buffer size will be replaced with the text 100. so for example if we say printf and we output buffer size here with percent d backslash n and we output buffer size if we save this compile our program and then run it well get a buffe