#include <stdio.h>

int main(int argc, char** argv)
{
    printf("Hello world! argc=%d, argv[0]=%s, argv[1]=%s, argv[2]=%s\n", argc, argv[0], argv[1], argv[2]);

    char buf[1024];
    char* rc = fgets(buf, sizeof(buf), stdin);
    if (!rc) perror("fgets");

    fputs(buf, stdout);
}