I have been going crazy all night and a good part of today. I can't get pass the build, I think I have my functions wrong. Can someone Please Help Me. I am going nuts. Here is what I have for code.

Thanks

Code:
#include "stdafx.h"
#include <math.h>

//#using <mscorlib.dll>

//using namespace System;

void display_statement (double, double, double, double, int, double);
double Tinterest_paid(double, int);
double payment_amount (double, double, int);



int main(void)

{
double a=1;
double b=1;
double c=1;
double d=1;
double e=1;
double x=1;
double i;                     // Interest_Rate Monthly
double p;                     // Principal
int n  ;                      // Number Payments display_statement
double Payment_Amount;
double payment;
double Total_Amount;
double total_amount;
double Tamount_paid;
double total_interest;
double Tinterest_paid(double, int);
double payment_amount (double, double, int);


	printf("Please Enter Interest Rate ");            // Key As n.n
		scanf("%lf",&i);
	printf("Please Enter Loan Amount ");              // Amount of Loan
		scanf("%lf",&p);
	printf("Please Number Of Monthly payments ");     // Number Of Monthly 
		scanf("%d",&n);

	payment = Payment_Amount (i,p,n);
    Total_Amount = Tamount_paid(payment,n);
    total_interest=Tinterest_paid(total_amount,p);

void display_statement (double, double, double, double, int, double);

}

{
	double x;

	x = Tinterest_paid(200000, 150000);
	printf("The result is\n\n %f', X);

		return 0;



}

double Tinterest_paid (double amount_paid, double Principal)

{

	double int_paid;

	int_paid = amount_paid - Principal;

	return (int_paid);

{

	double x;
	x = Payment_Amount(5.5, 100000, 60);

}

double Payment_Amount (double Interest_Rate, double Principle, int Number_Payments)

{
	double a, payment;

	a = Interest_Rate/100;
	a= a/12;

	payment = (a* Principle)/ (1 - pow((1+a), -Number_Payments));
	return(payment);
}

{
	display_statement (a, b, c, d, x, e);
	return 0;

}

void display_statement (double payment, double loan_payment, double Tinterest, double Principal, int Number_Payments, double interestrate)

{

	printf("Monthy Payment: $%.2f\n\n", payment);
	printf("Total Loan Amount; $%.2f\n\n", loan_Amount);
	printf("Total Interest Payment: $%.2f\n\n", Tinterest);
	printf("Principal: $%.2f\n\n", Principal);
	printf("Number Of Payments: %d\n\n", Number_Payments);
	printf("Interest Rate %.3f percent\n\n", interestrate);

}