I'm a bit new to C and ncurses, and I experiment with what I learn to make sure I understand it. I'm learning ncurses from here, and C from here, but I chose to not learn GTK from that C book because I'm not interested in front end development. I was trying to experiment with the mvprintw function in ncurses, but it didn't work. Running it in gdb shows this:
This program will print a letter on whatever coordinates you want
Enter an x coordinate: 2
Enter a y coordinate: 3
Enter the letter to print:
Program received signal SIGSEGV, Segmentation fault.
strlen () at ../sysdeps/arm/armv6/strlen.S:26
26 ../sysdeps/arm/armv6/strlen.S: No such file or directory.
(gdb) quit
A debugging session is active.
Inferior 1 [process 7659] will be killed.
Quit anyway? (y or n) n
Not confirmed.
(gdb) c
Continuing.
Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.
(gdb)
From what I understand, SIGSEGV means that I accessed a restricted part of the memory. How did I do this, and how do I prevent this? Here's my code:
#include <stdio.h>
#include <ncurses.h>
int main(int argc, char *argv[]){
// initialize ncurses
initscr();
// stop echoing
noecho();
printw("This program will print a letter on whatever coordinates you want\nEnter an x coordinate: ");
refresh();
// set 'x' to the user input
char x = getch();
printw("%c\n", x);
refresh();
printw("Enter a y coordinate: ");
refresh();
// set 'y' to the user input
char y = getch();
printw("%c\n", y);
refresh();
printw("Enter the letter to print: ");
// set input as letter
char word = getch();
printw("%s", word);
refresh();
// mvprintw(y, x, "%s", word);
// refresh();
// getch();
// endwin();
return 0;
}
(I have uncommented the last few lines since that's not where the error occurs)
char word = getch();
printw("%s", word);
is wrong. As you did in the lines before that, you should use %c, not %s, for printing one character.