FAQ: Loops: Lesson - for Loop

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This community-built FAQ covers the “for Loop” exercise from the lesson “Loops: Lesson”.

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[aggy_m]

Hello. Could someone explain this in for loops
for (int i = 99; i > 1; i–) when i put ; after i-- it causes error 'expected ‘)’ before ‘;’ token
but when I put for (int i = 99; i > 1;) it works fine.
When do we have to use semicolon within ‘for’ loop braces and when we don’t?

[8226919959]

I’m very confused as in why this doesn’t work for the first task.

[mtrtmk]

The expected output as per the instructions is:

...
3 bottles of pop on the wall.
3 bottles of pop on the wall.
Take one down and pass it around.
2 bottles of pop on the wall.
2 bottles of pop on the wall.
Take one down and pass it around.
1 bottles of pop on the wall.
1 bottles of pop on the wall.
Take one down and pass it around.
0 bottles of pop on the wall.

Your output is:

...
3 bottles of pop on the wall
Take one down and pass it around
2 bottles of pop on the wall
Take one down and pass it around
1 bottles of pop on the wall
Take one down and pass it around
0 bottles of pop on the wall

The issues with your output are:

• You don’t have periods (full stops) at the end of each sentence. The strings in the instructions do have periods.

• You only have two print statements inside the while loop. The instructions require three print statements inside the while loop.

[himdas2011]

The output is all right, but why is this not right ?

[mtrtmk]

// You wrote:
printf("Take on down and pass it around.\n");

// It should be:
printf("Take one down and pass it around.\n");

[script3387036359]

No need to use semicolon there. Your mistake was to use unusual dash, some long version of minus sighn.

[script3387036359]

Same here, as were in lesson 5/9. Script can’t see my “while”, or decrement, even if i used dummy “while” twice in code. Fixed with button “View solution” and copying propper code. After it lesson is saying that i completed both instructions.

[himdas2011]

Thanks for the correction