Arguments to main in C [duplicate]

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The signature of main is:

int main(int argc, char **argv);

argc refers to the number of command line arguments passed in, which includes the actual name of the program, as invoked by the user. argv contains the actual arguments, starting with index 1. Index 0 is the program name.

So, if you ran your program like this:

./program hello world

Then:

  • argc would be 3.
  • argv[0] would be “./program”.
  • argv[1] would be “hello”.
  • argv[2] would be “world”.

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