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#include <stdarg.h>

struct node { int a[4]; } x = {1,2,3,4};

print(char *fmt, ...);

main() {

        print("test 1\n");

        print("test %s\n", "2");

        print("test %d%c", 3, '\n');

        print("%s%s %w%c", "te", "st", 4, '\n');

        print("%s%s %f%c", "te", "st", 5.0, '\n');

        print("%b %b %b %b %b %b\n", x, x, x, x, x, x);

        return 0;

}

print(char *fmt, ...) {

        va_list ap;

        va_start(ap, fmt);

        for (; *fmt; fmt++)

                if (*fmt == '%')

                        switch (*++fmt) {

                        case 'b': {

                                struct node x = va_arg(ap, struct node);

                                printf("{%d %d %d %d}", x.a[0], x.a[1], x.a[2], x.a[3]);

                                break;

                                }

                        case 'c':

                                printf("%c", va_arg(ap, char));

                                break;

                        case 'd':

                                printf("%d", va_arg(ap, int));

                                break;

                        case 'w':

                                printf("%x", va_arg(ap, short));

                                break;

                        case 's':

                                printf("%s", va_arg(ap, char *));

                                break;

                        case 'f':

                                printf("%f", va_arg(ap, double));

                                break;

                        default:

                                printf("%c", *fmt);

                                break;

                        }

                 else

                        printf("%c", *fmt);

        va_end(ap);

}