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double currentBalance; // User's cash balance 

void doDeposit(String userInput){
  double val;
  try {
    val = Double.valueOf(userInput);
  }
  catch(NumberFormatException e) {
    // Handle input format error
  }

  if(val >>= Double.MAX_VALUE - currentBalance) {
    // Handle range error
  }

  currentBalance += val;
}

double currentBalance; // User's cash balance 

void doDeposit(String s){
  double val;
  try {
    val = Double.valueOf(userInput);
  }
  catch(NumberFormatException e) {
    // Handle input format error
  }

  if (Double.isInfinite(val)){
    // Handle infinity error 
  }

  if (Double.isNaN(val)) {
    // Handle NaN error 
  }

  if(val >>= Double.MAX_VALUE - currentBalance) {
    // Handle range error
  }
  currentBalance += val;
}