• Rerun certain part of code until a condition fails.
  • Can be achived by using for or while statements.
  • A for structure has three parts: init, test, and update. Each part must be separated by a semi-colon ";".
  • The loop continues until the test evaluates to false.
    • for (init; test; update) { 
  statements
}

int points_to_draw = 5;
int startX=10;
int startY=10;
for(int i=0; i < points_to_draw; i++){
	point(i*startX,i*startX);
}
  • The while structure executes a series of statements continuously while the expression is true.
    • while (expression) { 
  statements
}

int points_to_draw = 5;
int startX=10;
int startY=10;
while ( points_to_draw > 0) { 
 point( points_to_draw*startX, points_to_draw*startY);
 points_to_draw =  points_to_draw -1;
}
  • Use break; to end the execution of a structure such as switch(), for(), or while() and jump to the next statement after that.
    • int points_to_draw = 5;
int startX=10;
int startY=10;
while (true) { 
 if(points_to_draw == 0){
	break;
 }	
 point( points_to_draw*startX, points_to_draw*startY);
 points_to_draw =  points_to_draw -1;
}
  • Use continue; to skip the reminder of the block and jump to next iteration. Use inside of a for() or while().
    • //dont draw point no 3
int points_to_draw = 5;
int startX=10;
int startY=10;
while ( points_to_draw > 0) { 
 if(points_to_draw == 3){
  	continue;
 }	
 point( points_to_draw*startX, points_to_draw*startY);
 points_to_draw =  points_to_draw -1;
}