passing character array from functions

[MAQAH]

I need to pass one charcter, and the function will print the expected result.
#include<ncurses.h>
void passchar(int=24 , char='f');

int main()
{

initscr();
passchar(50,'g');

getch();
endwin();
return 0 ;
}

void passchar(int num, char chr[])
{

for(int i=0;i<num;i++)
{
move(i,2*i);
printw(chr);
}
}

This default arguments method works in iostream , but in ncurses it gives errors.
undefined reference to `passchar(int, char)'

what is this error and how to fix this or if this method is wrong the correct method please ?

[firedraco]

Well, your prototype states that you are going to pass an int and a char, but then your actual definition says you are passing an int and a char*. You'll need to make them the same somehow.

[MAQAH]

rather than that is there any way to print the character which we insert by calling the function. ?(without default arguments even)
if you know please ...