Property of Penn Engineering
MCIT 593 - Introduction to Computer Systems
argc and argv
The two default arguments to main recall C’s roots in Unix. They are used to pass command line
arguments to a program.
• int main (int argc, char **argv)
• argc – number of ‘words’ on the command line (argc >= 1)
• argv – list of strings containing all of these words
• Note the declaration of argv as a pointer to an array of pointers – double dereferencing.
Example:
int main (int argc, char **argv) {
int i;
for (i = 0; i < argc; ++i)
printf ("Argument %d = %s\n", i, argv[i]);
}
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