replace char in string

Question

i'm creating program to make letters lower_case, i have problem with replacing char in string saved in char* - result dumps core

https://code.sololearn.com/coCBw45kC4IW/?ref=app

problem -> s[i] += 'a' - 'A';

Answer 1

"HELLO WORLD" is stored in read only memory.
char* is an incorrect type to use, it should be const char*.

Attempting to write to read only memory will result in an access violation.

If you used char x[] then the read only memory will be copied to the stack, which is writeable, for x to use.
So no access violation happens there.

If you really want to use a pointer you have to allocate memory from the heap yourself.

Answer 2

You could have used a character array to store a string and there is really no need of character pointers because you know things get ugly with pointers.

Answer 3

well this solution I've already find out, I'd like to do it with pointer

Answer 4

thanks, this is right answer :D

Answer 5

ok, now there is second problem - changing the string, any other advice?

Answer 6

If you mean resizing, or adding/removing characters, this may help:
https://stackoverflow.com/questions/2937409/resizing-an-array-with-c

Answer 7

should i use some flush function?