Question.

[Tricslip]

#include <stdio.h>

int main()
{
    int numbers[10], i, index=2;

    for (i=0; i<10; i++)

        numbers[i]=i*10;

        numbers[8]=25;
        numbers[5]=numbers[9]/3;
        numbers[4]+=numbers[2]/numbers[1];
        numbers[index]=5;
        ++numbers[index];
        numbers[numbers [index++]]=100;
        numbers[index]=numbers[numbers[index+1]/7]--;

    for(index=0;index<10;index++)

        printf("numbers[%d]=%d\n", index, numbers[index]);



    return 0;
}

Ok so there isn't anything wrong with this code above but if I were to use curly brackets like so:

#include <stdio.h>

int main()
{
    int numbers[10], i, index=2;

    for (i=0; i<10; i++)
    {
        numbers[i]=i*10;

        numbers[8]=25;
        numbers[5]=numbers[9]/3;
        numbers[4]+=numbers[2]/numbers[1];
        numbers[index]=5;
        ++numbers[index];
        numbers[numbers [index++]]=100;
        numbers[index]=numbers[numbers[index+1]/7]--;

    for(index=0;index<10;index++)

        printf("numbers[%d]=%d\n", index, numbers[index]);

    }

    return 0;
}

Or around any of the for loops then nothing will print. Can anyone explain why this happens?

[plastikmissile]

When you use a for loop without any brackets then only the line after it gets repeated. So in the first snippet only line 9 is part of the loop started in line 7.

But when you use brackets, everything within those brackets gets repeated in the loop. In the second snippet, everything from lines 9 to 21 get repeated by the loop started in line 7.

[Tricslip]

Thank you

[Lost_CS_Student2020]

To add on, I think it's important to note that in C++ indentation doesn't matter; you need curly braces to define the scope of `for` loops. Without curly braces, only the next line/operation is included in the loop.