Why am I getting these errors in ncurses.h, in C++? - c++

Question

I am using g++ compiler. I am getting the errors mentioned below. Kindly let me know what my mistakes are, or any other function to get hold on position of the cursor.
Here's my code:
#include <ncurses.h> /* ncurses.h includes stdio.h */
#include <string.h>
#include<iostream>
using namespace std;
int main()
{
char mesg[]="Just a string"; /* message to be appeared on the screen */
int row,col; /* to store the number of rows and *
* the number of colums of the screen */
initscr(); /* start the curses mode */
getmaxyx(stdscr,row,col); /* get the number of rows and columns */
mvprintw(row/2,(col-strlen(mesg))/2,"%s",mesg);
/* print the message at the center of the screen */
mvprintw(row-2,0,"This screen has %d rows and %d columns\n",row,col);
printw("Try resizing your window(if possible) and then run this program again");
refresh();
getch();
endwin();
return 0;
}```
/*Here are the errors;
/tmp/ccJV4hnK.o: In function `main':
try9.cpp:(.text+0x34): undefined reference to `initscr'
try9.cpp:(.text+0x3b): undefined reference to `stdscr'
try9.cpp:(.text+0x47): undefined reference to `stdscr'
try9.cpp:(.text+0x60): undefined reference to `stdscr'
try9.cpp:(.text+0x6c): undefined reference to `stdscr'
try9.cpp:(.text+0xbf): undefined reference to `mvprintw'
try9.cpp:(.text+0xe4): undefined reference to `mvprintw'
try9.cpp:(.text+0xf3): undefined reference to `printw'
try9.cpp:(.text+0xf8): undefined reference to `refresh'
try9.cpp:(.text+0xff): undefined reference to `stdscr'
try9.cpp:(.text+0x107): undefined reference to `wgetch'
try9.cpp:(.text+0x10c): undefined reference to `endwin'
collect2: error: ld returned 1 exit status*/

Answer 1

Simply add
#include <curses.h>

Answer 2

I ran into the same problem..
You just have to add -lncurses behind the compilation command..
So for example:
clang test.c -lncurses
gcc test.c -lncurses

Answer 3

An “Undefined Reference” error occurs when we have a reference to object name in our code and the linker is not being able to find the definition when it tries to search for your functions initscr, stdscr, mvprintw, etc in all the linked object files and libraries. You must have missed including the appropriate header files.
#include <curses.h>