Menghitung gaji karyawan c++

#include<iostream.h>

#include<conio.h>

#include<math.h>

int main ()

{

int a,b,c,d,manager,assisten,sekretaris,karyawan,lembur;

int gajimanager=1300000,gajiassisten=900000,gajisekretaris=800000,gajikaryawan=600000;

int makan=15000,insentif=400000,uanglembur=15000;

if (d>=25)

{lembur=uanglembur*25;}

else {lembur=uanglembur*d;}

cout<<"1. Gaji Manager "<<endl;

cout<<"2. Gaji Assisten manager "<<endl;

cout<<"3. Gaji Sekretaris "<<endl;

cout<<"4. Gaji Karyawan "<<endl;

cout<<"5. Keluar "<<endl;

cout<<"*Masukkan Pilihan= ";cin>>a;

cout<<"*Masukkan Jumlah Hari Kerja= ";cin>>b;

cout<<"*Masukkan Jumlah Hari Tidak Kerja (25-b)= ";cin>>c;

cout<<"*Masukkan Jumlah Jam Lembur= ";cin>>d;

switch(a)

{

case 1 :

if(a<25)

{manager= (gajimanager + insentif + (makan*30)) - (c*makan);}

else {manager= gajimanager + insentif + (makan*30);}

cout<<"total gaji manager = "<<manager;

break;

case 2 :

if(a<25)

{assisten= (gajiassisten + (lembur*d) + (makan*30))- (c*makan);}

else

{assisten= gajiassisten + (lembur*d) + (makan*30);}

cout<<"total gaji assisten= "<<assisten;

break;

case 3 :

if(a<25)

{sekretaris= (gajisekretaris + (lembur*d) + (makan*30)) - (c*makan);}

else

{sekretaris= gajisekretaris + (lembur*d) + (makan*30);}

cout<<"total gaji sekretaris= "<<sekretaris;

break;

case 4 :

if(a<25)

{karyawan= (gajikaryawan + (lembur*d) + (makan*30)) - (c*makan);}

else

{karyawan= gajikaryawan + (lembur*d) + (makan*30);}

cout<<"total gaji karyawan= "<<karyawan;

break;

default:goto exit;}

exit:

getch();

}