THE LIST OF SOLVED PROBLEMS: 1.16-readline 1.20-detab 1.21-entab 1.22-spline 1.23-comments 1.24-syntax 2.6->2.9-bits 3.4->3.6-itob 4.3->4.9-calc 4.10-calc 5.2-getfloat 5.3->5.4-string 5.5-string 5.6-pointers 5.7-sort 5.8-arrays 5.9-arrays 5.10-expr 5.11-detab 5.11-entab 5.12-detab 5.12-entab 5.13-tail