arguments c

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
    char str[100];

    if (argc == 3 )
    {
        if (argv [1] == "-m")
        printf("%s", argv[2]);
        else
        printf("ERROR! Wrong argument\n");
    }
    else
    printf("No arguments has been found.\nEnter text.\n");

    scanf( "%s", &str);
    printf("%s", str);
    return 0;
}