что делать?

#include "stdafx.h"
#include <stdio.h>
 #include <math.h>
 #include <string.h>
#include "iostream"
using namespace std;           
 #define Pi 3.141
 
const bool c2=true;
 const bool b2=false;
 
int _tmain(int argc, _TCHAR* argv[])
{ 
    double 
 
 x,y,a,b,z,Denominator,Numerator;
 char
 FullName[80]="",FirstName[15],Surname[15];
 bool 
 z2;
 int
 iFirstName,iSurname,iFullName;
 printf("Pleas type initial data:\n\n");
 printf("x=");
 scanf("%f",&x);
 printf("a=");
 scanf("%f",&a);
 printf("b=");
 scanf("%f",&b);
 printf("c2=");
 scanf("%f",&c2);
 printf("b2=");
 scanf("%f",&b2);
 printf("your FirstName=");
 scanf("%s",&FirstName);
 printf("your Surname=");
 scanf("%s",&Surname);
 Numerator=sin(Pi-b/2)+log(2*x+a*a)+x*x+pow(x-a*a*a,1/4);
 Denominator=exp(x+a)+x*x*x+5.4*pow(10,-4)+tan(x*x+0.5*pow(10,2.10));
 y=Numerator/Denominator;
 z=!b && (x<y) || (x<1.5) && (x=0.1) || (y=-4.2);
 iFirstName=strlen("FirstName");
 iSurname=strlen("Surname");
 strcpy(FullName,FirstName);
 strcat(FullName,"");
 strncpy(FullName+iFirstName+1,Surname,iSurname);
 iFullName=strlen(FullName);
 printf("\n******** Final results ********\n\n");
 printf("Arithmetical expression y=%10.5f\n",y);
 printf("Boolean expression z=%d\n",z2);
 printf("My full name - %s\n","FullName");
 printf("Number characters in full name=%d\n\n","iFullName");
 system("pause");
    return 0;
}

Denominator=exp(x+a)+x*x*x+5.4*pow(10.0, -4)+tan(x*x+0.5*pow(10,2.10));