Is there a way to get a + or - to appear in front of my answer in Adobe forms

I have an adobe equation that I want to have a + or - appear in front of my answer. I would need to know how to make that happen

Here is a sample of how my formula ends:

else if (decimal==.875){

fracNumber = "7/8";

}

else

{fracNumber = "";}

if(whole ==0 && fracNumber != 0)

{event.value = (fracNumber)}

else if(whole ==0 && fracNumber == 0)

{event.value = 0}

else if(whole !=0 && fracNumber == 0)

{event.value = (whole)}

else{

event.value = (whole+" "+fracNumber)}        

}

}