[英]Java Divide by Zero - Calculator
我創建了一個 Java 計算器,但是我需要添加代碼,當數字除以零時,我將結果設置為零。 其他一切都在工作,我只是不知道在哪里添加這個語句。
繼承人的代碼:
public class Calculator
{
// Declaration of a long variable to hold the stored result
private long theResult = 0;
private long zero = 0;
// Evaluate an arithmetic operation on the stored result
// E.g evaluate( '+', 9) would add 9 to the stored result
// evaluate( '/', 3) would divide the stored result by 3
// actions are '+'. '-', '*', '/'
// Note: if the operation is
// evaluate( '/', 0 ) the theResult returned must be 0
// (Not mathematically correct)
// You will need to do a special check to ensure this
/**
* perform the operation
* theResult = theResult 'action' number
* @param action An arithmetic operation + - * /
* @param number A whole number
*/
public void evaluate( char action, long number)
{
if (action == '+'){
theResult += number;
}
else if (action == '-'){
theResult -= number;
}
else if (action == '*'){
theResult *= number;
}
else if (action == '/'){
theResult /= number;
}
}
/**
* Return the long calculated value
* @return The calculated value
*/
public long getValue()
{
return theResult;
}
/**
* Set the stored result to be number
* @param number to set result to.
*/
public void setValue( long number )
{
this.theResult = number;
}
/**
* Set the stored result to be 0
*/
public void reset()
{
if ( theResult != 0) theResult = 0;
// im not sure this is correct too
}
}
您只需在現有語句中嵌套一個 if 語句,如下所示:
else if (action == '/'){
if (number == 0){ //this is the start of the nested if statement
theResult = 0; //alternatively, you can just type "continue;" on this line since it's 0 by default.
}
else {
theResult /= number;
}
}
有兩種方法可以做到這一點。 第一個是這樣的:
else if (action == '/') {
if( number == 0 )
theResult = 0;
else
theResult /= number;
}
另一個選項假設您已經了解了異常:
else if (action == '/') {
try {
theResult /= number;
}
catch( ArithmeticException ae ) {
// possibly print the exception
theResult = 0;
}
}
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