Execution of printf() and Segmentation Fault

This is due to stream buffering of stdout. Unless you do fflush(stdout) or you print a newline "\n" the output is may be buffered.

In this case, it’s segfaulting before the buffer is flushed and printed.

You can try this instead:

printf("%s",name);
fflush(stdout);        //  Flush the stream.
name[1]='s';           //  Segfault here (undefined behavior)

or:

printf("%s\n",name);   //  Flush the stream with '\n'
name[1]='s';           //  Segfault here (undefined behavior)