[upuli]

dear members
I want to add an if statement to an OpenFOAM solver. There's a variable gastotalmass. If this variable(gastotalmass) is not equal to 0.0 the other variables will be calculated.It is written in the programme as below.

{
if (gastotalmass=0.0)
{

volScalarField YCO
(
"YCO",
mCO/(mCO+mCO2+mCH4+mH2+mH2O+mN2+mO2)
);

}
else
{
volScalarField YCO = 0.0
}
}
but I get the following error

variables.H:31:21: error: could not convert ‘gastotalmass.Foam::GeometricField<Type, PatchField, GeoMesh>:perator= [with Type = double, PatchField = Foam::fvPatchField, GeoMesh = Foam::volMesh]((* & Foam::dimensioned<double>((* &0.0))))’ from ‘void’ to ‘bool’
variables.H:72:22: error: conversion from ‘double’ to non-scalar type ‘Foam::volScalarField {aka Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>}’ requested
variables.H:74:22: error: conversion from ‘double’ to non-scalar type ‘Foam::volScalarField {aka Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>}’ requested
variables.H:76:23: error: conversion from ‘double’ to non-scalar type ‘Foam::volScalarField {aka Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>}’ requested
variables.H:78:22: error: conversion from ‘double’ to non-scalar type ‘Foam::volScalarField {aka Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>}’ requested
variables.H:80:23: error: conversion from ‘double’ to non-scalar type ‘Foam::volScalarField {aka Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>}’ requested
variables.H:82:22: error: conversion from ‘double’ to non-scalar type ‘Foam::volScalarField {aka Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>}’ requested
variables.H:84:21: error: conversion from ‘double’ to non-scalar type ‘Foam::volScalarField {aka Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>}’ requested



can someone please help me to solve this.