Thread: Quick question about SIGSEGV

Code:

int main (void)
{
        char* s;
        char* p = "hello";
        printf("Programme to reverse all elements in a string, using recursion.");
        printf("\nYou will be required to enter a word up to 20 letters long.\n");
                                                                                                                
        printf("WORD: HELLO");/*
        p = strin(stdin);*/
                                                                                                                
        printf("\n %s", p); <==== SIGSEGV
                                                                                                                
        s = reverse(p);
                                                                                                                
        puts(s);
        return 0;
}

I won't post the rest of the code, namely the reverse function, because that part isn't even reached when seg fault occurs. The part of the programme we're talking about is just a normal assignment and output.

The problem is your reverse function. You're trying to modify a string literal. It seems like the problem is the print statement, but because you don't have an fflush after the printf or a newline at the end of the format string, the buffer isn't flushed and you don't see the output before reverse is called. Change your print to this and see what happens:

Code:

printf("\n %s\n", p);

Then change your declaration to this and see the problem vanish:

Code:

char p[] = "hello";