Why is extern used in c?


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main() { char *ptr = "Ramco Systems"; (*ptr)++; printf("%s\n",ptr); ptr++; printf("%s\n",ptr); } Find the Outputs?

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What are extern variables in c?

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Explain what are preprocessor directives?

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can you explain in brief what is "r+" mode in a file... i know that it si used to read and modify rhe existing content.... but explalanation about the file pointer in "r+" mode i wann to know???????????

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