for() Control Iteration Web & Application for_.gif


for(int i=0; i<40; i=i+1) {
  line(30, i, 80, i);
}

for_2.gif


for(int i=0; i<80; i=i+5) {
  line(30, i, 80, i);
}

for_3.gif


for(int i=40; i<80; i=i+5) {
  line(30, i, 80, i);
}

for_4.gif


for(int i=30; i<80; i=i+5) {
  for(int j=0; j<80; j=j+5) {
    point(i, j);
  }
}

Controls a sequence of repetitions. 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. When a for() structure is executed, the following sequence of events occurs:
1. The init statement is executed
2. The test is evaluated to be true or false
3. If the test is true, jump to step 4. If the test is False, jump to step 6
4. Execute the statements within the block
5. Execute the update statement and jump to step 2
6. Exit the loop. for(init; test; update) { statements } init statement executed once when beginning loop test if the test evaluates to true, the statements execute update executes at the end of each iteration statements collection of statements executed each time through the loop while() 1.0 Structure PDE