Is it possib le to incremennt a pointer value (not the address)

[vittorioc98]

Hello guys, is it possible to increment the pointer value like this?

  int main(){
    char* str = "Hello WoRLd! Today’s temperature is 34°C.";
        while(str != '\0'){
            (*str) += 32;
            str++;
        }
    printf("%s\n", str);
    return 0;
}

Because it gives me a Segmentation fault.. am i doing wrong?
Thanks in advice.

[lastchance]

Most of your code is illegal.

Not sure what you are trying to do, but ...

#include <cstdio>
int main()
{
   char s[] = "Hello WoRLd! Today's temperature is 34øC.";
   char *str = s;
   while( *str != '\0')
   {
       (*str) += 32;
       str++;
   }
   printf("%s\n", s);
}

[helios]

The string "Hello WoRLd! Today’s temperature is 34°C.", which str points to, is kept in read-only memory, so when you try to write to it, the system kills your program.
You can tell the compiler to make a copy of it in writable memory and then get a pointer to it:

char string[] = "Hello WoRLd! Today’s temperature is 34°C.";
char *str = string;

The rest of the code will be valid then.

[coder777]

Yes, it is possible to modify the content pointed to.

What you are doing wrong is modifying read only memory which that "Hello world" string literal is. An expression like line 2 should at least give a warning like this:

warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]

[vittorioc98]

Ok i fixed, thanks to you guys!!!!!! :DDD