Introducing multiple if()… statements

The switch statement tests a single value. Could we have done this another way? Yes – with the if()… else if()… else if()… else… construct. We could have written the calc() function using multiple if()… else… statements, in this way:

double calc( double operand1 , double operand2 , char operator )  {

  double result = 0.0;

  printf( "%g %c %g = " , operand1 , operator , operand2 );

  if( operator == '+' )

      result = operand1 + operand2;

  else if( operator == '-' )

      result = operand1 - operand2;

  else if( operator == '*' )

      result = operand1 * operand2;

  else if( operator ==  '/'

      if( operand2...