Print an array of strings and ignore nulls

[COKEDUDE]

I have four array of strings. I would like to print out the strings with this formatting:

                        printf(" %d \t %s \t %s \t %s \t %s.\n",
                        quadruples_line_counter,
                        strings_quadruples1_action[0],
                        strings_quadruples2_variable1[0],
                        strings_quadruples3_variable2[0],
                        strings_quadruples4_temp_variable[0]);

It gives this output:

 17      func    sub     int     3.
 17      param   (null)          (null)          (null).
 17      alloc           4       (null)          xa.
 17      alloc           4       (null)          y.
 17      alloc           4       (null)          z.
 17      multiply        55      y       t0.
 17      divide          t0      z       t1.
 17      plus            xa      t1      t2.
 17      plus            t2      x       t3.
 17      func    main    void    0.
 17      alloc           4       (null)          a.
 17      alloc           4       (null)          b.
 17      alloc           4       (null)          c.
 17      arg             (null)          (null)          x.
 17      arg             (null)          (null)          y.
 17      arg             (null)          (null)          z.
 17      call            sub     3       t5.
 17      assign          t5      (null)          y.

How would I go about ignoring the nulls when printing? I am not sure how to do this.

[rproffitt]

I'd stop doing this now. Why? Read a prior discussion about printf and null at
http://stackoverflow.com/questions/11589342/what-is-the-behavior-of-printing-null-with-printfs-s-specifier

The long answer is that you add code to detect such and replace the string with what you want to print or use another printf if you so choose.