Question

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Why do I get a segmentation fault when writing to a string?

Here is a small function, was testing something so wrote it. Here i tried to increment a character value of the string literal when i tried doing so i got a segmentation fault. Can you please tell what i am doing wrong here

#include <stdio.h>
int input_string(char *str)
{
  printf("%s\n", str);
  printf("%c\n", *str);
  printf("%c\n", (*str)++); // I get a segmentation fault here, cant i increment the value like this ?
}
void main()
{
  char *str = "andrew";
  input_string(str);
}

Answer 1

What this char *str = "andrew"; does is create a pointer to a string that MAY be located on .text (where the executable code resides) and trying to modify it is undefined behavior.

Change it for this:

char str[] = "andrew";

It will make a copy of the string in a stack allocated buffer that you can safely modify.