Caesar question chapter2

Question

    // k is between 1 and 26
    for (int i = 0, n = strlen(s); i < n; i++)
    {
        // only for capital letters
        if (s[i] >= 'A' && s[i] <= 'Z')
        int dif = 'Z' - s[i];     //// how far is s[i] to Z ?
        // to understand if we need to go through Z to A
        if (k > dif)
        {
            k -= dif;
            // this step includes A in the counting process as well because we need to count k -= dif number from Z and this isn't possible to my logic
            s[i] = 'A' + (k-1);
        }
        // if the transformation of letters is completed withouth needing to go through Z to A
        else
        {
            s[i] = (k);
        }
    }
caeser.c:29:13: error: expected expression
        int dif = 'Z' - s[i];     //// how far is s[i] to Z ?
        ^

caeser.c:31:21: error: use of undeclared identifier 'dif'; did you mean 'div'? if (k > dif)

That's a part of my code for which I get an an error in the line: int dif .... and in the following lines because of "undeclared identifier" normally. The error is called "expected expression". That's the first time that I'm declaring a variable called dif and 'Z' - s[i] should be cast to int automatically, as far as I understood. Why am I having this error ?

Answer 1

I only needed to add some extra braces for the if condition beneath the for loop.

Answer 2

Can you copy and paste the exact error? (Code format, error will show line and place and maybe more detail)

undeclared identifiers will come when you forget to do

include

include at the top of your file.