Stuff

#include <stdio.h>

char input[50];

int main()
{
	do
	{
		
	}
	while (loop_for_input(&input) != 0);
	
	return 0;
}

int loop_for_input(char **input)
{
	printf("Enter reverse polish notation string to process.  End with return.  Type 'n' or 'N' to quit\n");
	return 0;
}

// rpncalc.c: In function 'int main()':
// rpncalc.c:24: error: 'loop_for_input' was not declared in this scope