How to read this: Invalid read of size 1 Your program is trying to read one byte from somewhere that Valgrind doesn’t like. at 0x401569: main (:395) Where in the code this happens (clearly strcmp has been inlined) Address 0x0 is not stack’d malloc’d or (recently) free’d What the address it was reading – 0x0 … Read more
There is a misconception here with what const means, probably because it’s a little confusing that this works: but this doesn’t: The issue is that the array size in an array declaration must be a core constant expression. Simplified, that means an expression that’s evaluatable at compile time to be a constant. That is true in the … Read more
It returns a reference to an int. References are similar to pointers but with some important distinctions. I’d recommend you read up on the differences between pointers, references, objects and primitive data types. “Effective C++” and “More Effective C++” (both by Scott Meyers) have some good descriptions of the differences and when to use pointers vs references. … Read more
I’m trying to ask the user to type in a string so I will print the length of the string. My code is built succeeded. However, when I entered a word and pressed ‘enter’, the program keeps running. I had to enter a second word, then the length of the first string displays. I’m confused … Read more
You’re attempting to free something that isn’t a pointer to a “freeable” memory address. Just because something is an address doesn’t mean that you need to or should free it. There are two main types of memory you seem to be confusing – stack memory and heap memory. Stack memory lives in the live span of the function. … Read more
Declaration A prototype for a function which takes a function parameter looks like the following: This states that the parameter f will be a pointer to a function which has a void return type and which takes a single int parameter. The following function (print) is an example of a function which could be passed to func as a parameter because it is … Read more
I get that compilation error because of this line which intended to increase the pointer by 0x200 (to point to the next segment) I’v seen this but I didn’t use any illegal symbol! P.S. The initialization of the pointer:
For C++: If you just need a container just use std:vector. It will take care all the memory allocations necessary for you. However if you want to develop your own dynamic container (whatever reasons you have) you have to take care off the memory allocations yourself. That is, when your array grows you have to allocate new … Read more
Declaration A prototype for a function which takes a function parameter looks like the following: This states that the parameter f will be a pointer to a function which has a void return type and which takes a single int parameter. The following function (print) is an example of a function which could be passed to func as a parameter because it is … Read more
I get that compilation error because of this line which intended to increase the pointer by 0x200 (to point to the next segment) I’v seen this but I didn’t use any illegal symbol! P.S. The initialization of the pointer: