Why (argv[1] == "a") returns false when set the 1st argument with "a"

Asked May 28 '20 at 03:31

Active May 28 '20 at 03:34

Viewed 34 times

I try to parse command line arguments in Clang,

int main(int ac, char *av[]) {
    if (av[1] == "a")
        printf("yes\n");
    return 0;
}

When I execute the ./a.out a, nothing printed. (av[1] == "a") returns false. Why?

edited May 28 '20 at 03:34

Steve Friedl

asked May 28 '20 at 03:31

lufy

2

Strings in C don't compare this way: consider `if (strcmp(av[1], "a") == 0)` to test for "yes". – Steve Friedl May 28 '20 at 03:33
1

`av[1] == "a"` compares pointers, not the _string_ contents. – chux - Reinstate Monica May 28 '20 at 03:35
Thanks. I misunderstood type of `argv[1]`. – lufy May 28 '20 at 04:20
Sorry to say that, but then you must also have misunderstood type of `"a"` in the same way. – Gerhardh May 28 '20 at 05:57

0 Answers0