Write a C code to enter two non$-$negative integers $($n and x$),$ then print the frequency of digit x in the number n$.-$ both n and x should be positives or zero. If neither is negative, then print $($invalid input$)-$ n can be any non$-$negative number, while x should be a digit $($acceptable values are between $0$ and $9$ only$).$ If the user enters x outside the range $[0,9],$ then print $($invalid digit$)$ Example: n $=123219911$ x $=1,$ then the frequency is $=4(1$ is repeated $4$ times in n$)$ n $=-12319$ x $=9,$ then print $($invalid input$)$ n $=12434259$ x $=43,$ then print $($invalid digit$)$