The problem is here: Basically, when you free temp2, you free first, not the memory allocated here: , which remains a memory leak, because after the assignment it can’t be freed anymore. Also, your code has probably some more problems (one is that you shouldn’t use fflush on an input stream), but without some more details, it’s … Read more
I can use pointers, but I am a bit afraid of using them. If you need a dynamic array, you can’t escape pointers. Why are you afraid though? They won’t bite (as long as you’re careful, that is). There’s no built-in dynamic array in C, you’ll just have to write one yourself. In C++, you … Read more
strcpy(ptr2, ptr1) is equivalent to while(*ptr2++ = *ptr1++) where as strdup is equivalent to (memcpy version might be more efficient) So if you want the string which you have copied to be used in another function (as it is created in heap section) you can use strdup, else strcpy is enough.
In C, using a previously undeclared function constitutes an implicit declaration of the function. In an implicit declaration, the return type is int if I recall correctly. Now, GCC has built-in definitions for some standard functions. If an implicit declaration does not match the built-in definition, you get this warning. To fix the problem, you have to … Read more
wait(NULL) will block parent process until any of its children has finished. If child terminates before parent process reaches wait(NULL) then the child process turns to a zombie process until its parent waits on it and its released from memory. If parent process doesn’t wait for its child, and parent finishes first, then the child process becomes orphan and is … Read more
I wrote this function to read a line from a file: The function reads the file correctly, and using printf I see that the constLine string did get read correctly as well. However, if I use the function e.g. like this: printf outputs gibberish. Why?
In the function second(), the assignment word = “ab”; assigns a new pointer to word, overwriting the pointer obtained through malloc(). When you call free() on the pointer later on, the program crashes because you pass a pointer to free() that has not been obtained through malloc(). Assigning string literals does not have the effect of copying their content as you might have thought. To … Read more
Trying to understand memory allocation in C. Facing issue while trying to create two arrays using pointer to integers. Kindly have a look at the below code: I am working with C11 on CLion. Facing below error on runtime. Can someone please explain what is wrong with this code ? “b is being shown NULL … Read more
You are using a function for which the compiler has not seen a declaration (“prototype“) yet. For example: You need to declare your function before main, like this, either directly or in a header:
EDIT: As pointed out in the comment, itoa() is not a standard, so better use sprintf() approach suggested in the rivaling answer! You can use itoa() function to convert your integer value to a string. Here is an example: If you want to output your structure into a file there is no need to convert any value beforehand. You can just use … Read more