$6.$ Implement a function in C$++$ named MathExpression$()$ with a void return type and a single argument named msg that represents a series of mathematical operations that need to be evaluated from left to right. Call this method and pass the value collected in Step $5$ for the argument. Implement the function to provide the following functionality:

a$.$ Calculate the result of any mathematical equation up to $100$ characters in length.

b$.$ Evaluate the equation operations from left to right.

c$.$ Ignore any spaces entered.

d$.$ Do not change the order of operations if parentheses are entered in the equation. All parenthesis should be ignored.

e$.$ Provide support for the following mathematical operators $+,-,*,/,$ and $\%.$

f$.$ The user should be able to specify numbers with decimal information in the equations $($i$.$e$.,5\mathrm{.}67*6\mathrm{.}21/3\mathrm{.}2).$

g$.$ Convert the operands of the current operation to integers when performing the modulus operation.