FAQ: Loops: Lesson - for Loop

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

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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?


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

2 Likes

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.

1 Like

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

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

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

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

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.

1 Like

Thanks for the correction

hey! why do we need to have for loops in c in this format (int i=99;i>=0;i–), instead of (i>=0;i–)? Why can’t the for loop use a value declared before it?

It can…there’s no problem in that.
For example: if your declare int i before the loop you can use it… like:

#include <stdio.h>
//this simple program prints numbers 10 to 1
int main() {
int i = 11;
 for(i > 0; i--;) {
printf("%d", i);
}
}

The decrement sign should be ‘- -’ NOT only ‘-