[ il2 | icmbranching | ij ]

 
 for  <i_index> = <i_from> ,  <i_to> [, <i_increment> ] 
  ... 
  ... 
 endfor 

 
 while( <logical_expression> ) 
  ... 
  ... 
 endwhile 

 
 for i = 1, 9 
   print "ICM-shell proudly announces that i=" i 
 endfor 
 
 for i = 1, 4 
   print "ICM-shell proudly announces that i=" i 
   for j = 1, 3 
     print "ICM-shell proudly announces that nesting is possible and j=" j 
   endfor 
 endfor 
 
 read object "crn" 
 for i = 1, Nof(a_/*)  # Nof(a_/*) means 'the number of residues' 
   print Label(a_/$i) 
 endfor 
 
 i = -2 
 while (i != 4) 
   i = i+1 
   print i 
 endwhile 
 
 while(yes) 
   print "endless loop, please wait 8-)" 
 endwhile 

 
 if ( <logical_expression> ) <command> 

 
 if ( <logical_expression> ) then 
    ... 
    ... 
 endif 

 
 if( <logical_expression> ) then 
     ... 
 else 
     ... 
 endif 

 
 if ( <logical_expression> ) then 
   ... 
 elseif ( <logical_expression> ) then 
   ... 
 elseif ( <logical_expression> ) then 
   ... 
 else 
   ... 
 endif 

 
 JohnnySaid = "The gloves didn't fit" 
 if ( JohnnySaid == "The gloves didn't fit" ) print "You must acquit" 
# 
 grade = "bad" 
 if (grade == "excellent") then 
   print "It's great!" 
 elseif (grade == "good") then 
   print "It's good!" 
 elseif (grade == "bad") then 
   print "It's not so bad!" # do not be harsh on your kids 
 endif 

 
 <for-loop> or <while-loop> 
     ... 
     if ( <logical expression> ) break 
     ... 
 <end of loop> 

 
 <for-loop> or <while-loop> 
     ... 
     if ( <logical expression> ) continue 
     ... 
 <end of loop> 

 
 ... 
 if ( <logical expression> ) goto <label> 
 ... 
 ... 
 <label>: 
 ... 

 
 
    for i = 1, 6 
      print "currently i=", i, "and it will be increased at the next step" 
      if (i == 3) then 
        print "... but at this point we should stop it, sorry..." 
        break 
      endif 
   endfor 
   print "end of the loop demonstrating *break*, bye" 
 
    for i = 1, 6 
      if (i == 3) then 
        print "... let us skip over step 3 and continue looping" 
        continue 
      endif 
      print "currently i=", i, "and it will be increased at the next step" 
   endfor 
   print "end of the loop demonstrating *continue*, bye" 
 
   for i = 1, 5 
     if (i == 3) then 
       print "... but at this point we decided to skip 3-rd step, sorry..." 
       goto A 
     endif 
     print "currently i=", i, "and it will be increased at the next step" 
A:   print " "  
   endfor 
   print "end of the loop demonstrating 'goto', bye"