To
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Keyword used to indicate the final value of the control value in a For loop, and that the loop is to increment the control variable by 1 on each loop. The value specified by TO should be greater than the initial value of the for loop.
For to do
var i : integer;
begin
for i := 1 to 10000 do
begin
//...
end;
end;
The for to allow to execute code repeatedly for a fixed number of times.
Basic example
var
loopValue, startValue, endValue, resultValue: integer;
begin
startValue := 10;
endValue := 11;
resultValue := 0;
for loopValue := startValue to endValue do
begin
resultValue := loopValue + resultValue;
end;
end;
The loop execute two times and variable resultValue value is 21.
Start and end value same
var
loopValue, startValue, endValue, resultValue: integer;
begin
startValue := 10;
endValue := 10;
resultValue := 0;
for loopValue := startValue to endValue do
begin
resultValue := loopValue + resultValue;
end;
end;
The loop execute one time and variable resultValue value is 10.
Start value bigger than end value
var
loopValue, startNumber, endNumber, resultValue: integer;
begin
startValue := 10;
endValue := 9;
resultValue := 0;
for loopValue := startValue to endValue do
begin
resultValue := loopValue + resultValue;
end;
end;
The loop execute none time and variable resultValue value is 0.