Code:
#include <stdio.h>

/* print Fahrenheit-celsius tabel
    voor fahr = 0, 20, ...., 300 */
main()
{
        int fahr, celsius;
        int lower, upper, step;

        lower = 0;      /* lower limit of temperature table */
        upper = 300;    /* upper  ||    || ||           || */
        step = 20;      /* step size */

        fahr = lower;
        while (fahr <= upper) {
                celsius = 5 * (fahr-32) / 9;
                printf(%d\t%d\n", fahr, celsius);
                fahr = fahr + step;
        }
}
Error:
xitron@citix:~/C$ gcc -o fahr_cels fahr_cel.c 
fahr_cel.c: In function ‘main’:
fahr_cel.c:17: error: expected expression before ‘%’ token
fahr_cel.c:17: error: stray ‘\’ in program
fahr_cel.c:17: error: stray ‘\’ in program
fahr_cel.c:17: error: missing terminating " character
fahr_cel.c:19: error: expected ‘;’ before ‘}’ token

whats wrong?