Question

所以我在android studio中制作了一个简单的和应用程序

public void add(View view){
    EditText editText1 = (EditText) findViewById(R.id.editText);
    EditText editText2 = (EditText) findViewById(R.id.editText2);
    EditText editText3 = (EditText) findViewById(R.id.editText3);

    Float firstNumber = Float.valueOf(editText1.getText().toString());
    Float secondNumber = Float.valueOf(editText2.getText().toString());

    Float sum = firstNumber + secondNumber;

    editText3.setText(sum.toString());
}

如何更改此值以便对两个数字之间的所有整数求和例如，如果Text1 = 1且Text2 = 5则总和应为1 + 2 + 3 + 4 + 5

Answer 1

这样的事情：

public void add(View view){
    EditText editText1 = (EditText) findViewById(R.id.editText);
    EditText editText2 = (EditText) findViewById(R.id.editText2);
    EditText editText3 = (EditText) findViewById(R.id.editText3);

    int firstNumber = Integer.valueOf(editText1.getText().toString());
    int secondNumber = Integer.valueOf(editText2.getText().toString());

    int sum = 0;
    for(int i = firstNumber; i <= secondNumber; i++)
    {
        sum+=i;
    }

    editText3.setText("" + sum);
}

Answer 2

您可以使用此方法查找总和

int sum(int smallest, int largest) {
    int length = (largest - smallest + 1);

    int sum = length * (smallest + largest) / 2;

    return sum;
}

你可以这样打电话，

int firstNumber = Integer.parseInt(editText1.getText().toString());
int secondNumber = Integer.parseInt(editText2.getText().toString());

int sum = sum(firstNumber, secondNumber);

editText3.setText(sum.toString());

Answer 3

试试这个

    int firstNumber, secondNumber;
    float ans = 0;  
    Button.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
         ans = 0;
        firstNumber = Integer.parseInt(editText1.getText().toString());
        secondNumber = Integer.parseInt(editText2.getText().toString());

        for (; firstNumber <= secondNumber; firstNumber++) {
            ans += firstNumber;
        }
        editText3.setText(ans + "");
    }
});

如何在Java中添加两个数字之间的所有整数？

3 个答案: