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The problem is with your scanf and the fact that you are telling it it will read an int but you give it a char. ASCII values may be represented by integers, but scanf can distinguish them. It checks f …

Say you want an array of integers, you can do it like that: printf("What is the length of the array? …

Yes you are correct. The compiler knows what data type you are using and traverses by the correct amount of bytes every time. You just tell it how many places away from zero you want (by the + i). You …

What you want to say, is that the array is immutable, which means once you have declared their length, you can't change it to add more values. … Or when a new student arrives, but your array is full, you can create a new array, with a bigger length, copy all the values you have stored on the first array, and then add the new student. …

Just like _POST your positions is an associative array. Just as you get $_POST["symbol"] you get $positions["price"]. If I understood correctly you want to do something like the following <? …

It's because when you run an SQL query with execute(), all the affected records in the database are returned to you, in an array of dictionaries. So you want the first dictionary in that list. … But if you gave for example a query that returns all users whose name starts with an S, you might want to use the whole array. Hope that helps. …

A good idea would be to create an array of ints, with the same length as the key, and populate it with the numeric representation of the key. …