variables.h
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 #ifndef VARIABLES
 #define VARIABLES
 
 #include "initials.h"
 #include "exit-codes.h"
 
 // phi, rho_g, Ug, Ul
 typedef struct {
   double p1, p2, p3, p4;
 } PrimitiveVars;
 
 // phi*rho_g, phi*rho_g*Ug, (1-phi)*rgo_l, (1-phi)*rho_l*Ul
 typedef struct {
   double u1, u2, u3, u4;
 } ConservVars;
 
 // type conversions
 ConservVars primitive2conserv (PrimitiveVars pv);
 PrimitiveVars conserv2primitive (ConservVars cv);
 PrimitiveVars num2primitive (double num);
 ConservVars num2conserv (double num);
 
 // output
d01a82b1
 int sprintf_PrimitiveVars (char* str, PrimitiveVars vars);
 int sprintf_ConservVars (char* str, ConservVars vars);
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 // PrimiriveVars operator overloading
 const PrimitiveVars operator+ (PrimitiveVars v1, PrimitiveVars v2);
 const PrimitiveVars operator- (PrimitiveVars v1, PrimitiveVars v2);
 const PrimitiveVars operator* (PrimitiveVars v1, PrimitiveVars v2);
 const PrimitiveVars operator/ (PrimitiveVars v1, PrimitiveVars v2);
 // Primitive-Number operator overloading
 const PrimitiveVars operator+ (PrimitiveVars vars, double num);
 const PrimitiveVars operator+ (double num, PrimitiveVars vars);
 const PrimitiveVars operator- (PrimitiveVars vars, double num);
 const PrimitiveVars operator- (double num, PrimitiveVars vars);
 const PrimitiveVars operator* (PrimitiveVars vars, double num);
 const PrimitiveVars operator* (double num, PrimitiveVars vars);
 const PrimitiveVars operator/ (PrimitiveVars vars, double num);
 const PrimitiveVars operator/ (double num, PrimitiveVars vars);
 
 // ConservVars operator overloading
 const ConservVars operator+ (ConservVars v1, ConservVars v2);
 const ConservVars operator- (ConservVars v1, ConservVars v2);
 const ConservVars operator* (ConservVars v1, ConservVars v2);
 const ConservVars operator/ (ConservVars v1, ConservVars v2);
 // Conserv-Number operator overloading
 const ConservVars operator+ (ConservVars vars, double num);
 const ConservVars operator+ (double num, ConservVars vars);
 const ConservVars operator- (ConservVars vars, double num);
 const ConservVars operator- (double num, ConservVars vars);
 const ConservVars operator* (ConservVars vars, double num);
 const ConservVars operator* (double num, ConservVars vars);
 const ConservVars operator/ (ConservVars vars, double num);
 const ConservVars operator/ (double num, ConservVars vars);
 
 #endif // VARIABLES