polink error ??

[loongkee]

here's the code

#include<stdio.h>


#define basic_cost 5.00
#define cost_1000_liter 1.10
#define fine 2.00 


float calc_usage_cost(int , int );
float calc_unpaid_cost(float );
float calc_total_bill( float, float);
void print_bill(int ,float);


int main()
{
	int prev_meter , cur_meter , act_num;
	float unpaid_bill, usage, unpaid, total, collection=0;
	char choice;


	printf("------------------Perlis Water----------------");
	printf("this program generates monthly water bill");
	printf("------------------------------------------------------");


	do
	{
		printf("Enter account number:");
		scanf("%d", &act_num);
		printf("enter unpaid bill :");
		scanf("%f", &unpaid_bill );
		printf("Enter previous and current meters :");
		scanf("%d%d", &prev_meter, &cur_meter);
		
		usage = calc_usage_cost(prev_meter , cur_meter);
		unpaid = calc_unpaid_cost(unpaid_bill);
		total = calc_total_bill( usage , unpaid );
		print_bill(act_num, total);
		collection = collection + total;


		printf("Do you wish to continue:");
		scanf("%c", &choice);
	} while((choice == 'y' ) || (choice == 'Y'));


	printf("Perlis water collection : %.2f", collection);


	return 0;
}


float calc_usage_cost(int prev, int cur )
{ 
		float water_usage, usage_cost;
		water_usage = cur - prev;
		usage_cost = (water_usage/1000) * cost_1000_liter;
		return(usage_cost);
}


float calc_unpaid_cost(float unpaid)
{
	float unpaid_cost;
	
	if (unpaid >0)
		unpaid_cost = unpaid + fine;
	else 
		unpaid_cost = 0;
	return(unpaid_cost);
}


float cal_total_bill( float usage_cost, float unpaid_cost)
{
	float total_bill;
	total_bill = basic_cost + usage_cost + unpaid_cost;
	return(total_bill);
}


void print_bill(int act_num ,float total_bill)
{
	printf("\n\nYour account number is %d \n", act_num);
	printf("Your total bill is RM %5.2f\n", total_bill);
}

got this error when execute :
Building function2.obj.
Building lab.exe.
POLINK: error: Unresolved external symbol 'calc_total_bill'.
POLINK: fatal error: 1 unresolved external(s).
*** Error code: 1 ***
Done.

so what's the problem ?

[Salem]

Spelling

total = calc_total_bill( usage , unpaid );

float cal_total_bill( float usage_cost, float unpaid_cost)

[loongkee]

ok..
thank you