Do you really use the "Calculator" in Windows7?

"Calculator" is an indispensable tool in different versions of Windows. Although it has a single function, it is indeed an indispensable auxiliary tool in people's daily work. This article will talk about its use.

I. Standard and Scientific Panels We can launch it from the Windows Accessories menu or directly by running a program called "CALC.EXE". The calculator has two types of panel views: “Standard” and “Scientific”. The “Standard” panel (^31060301a^) is equivalent to the ordinary calculator used in our daily life. It can add, subtract, and multiply decimal numbers. Basic arithmetic functions such as reciprocal and square root. The "scientific" panel (^31060301b^) is equivalent to the functional calculator we usually call, and the calculation function is stronger and more perfect.

Easily switch between items by selecting them from the View menu and the values ​​displayed in the panel will be cleared when switching. Therefore, if you do not want to lose data, you need to use the "calculator" storage function. The specific operation is as follows:

1. Click the “MS” button to save the current display value, and the “M” will be displayed in the box above the “MC” button;

2 When calculating, click the "MR" button to read the saved value back to use.

It should be noted that only the most recently stored data can be stored in the memory.

Second, the use of commonly used buttons

If the button is gray, it is currently unavailable.

1. "CE": Clear the currently displayed value. This function can be used to modify the value of the wrong input. To calculate 60×40, after entering 60, click the “*” button and enter the second one. Number, originally should be entered 40, but accidentally lost to 77, it does not matter, click the "CE" button will be 77 to clear, then enter the correct value of 40, and finally click the "=" button to complete the calculation.

2. "C": Clear all data (including the input operation amount, operation intermediate value or result value), and complete the calculator's zeroing work.

3. "/-": Change the positive and negative of the currently displayed data.

4. "pi": Enter the value of the pi. Select "Inv" and click on it to enter 2*pi(6.28...).

5. "MC": Clear the value in the memory area;

"M": Add the currently displayed value to the value in the memory and save the result, via the "MR" button The result value can be displayed.

6. "F-E": Turns scientific notation on or off. For numbers greater than 10^32, it is always expressed exponentially.

"Exp": Allows you to enter numbers in scientific notation, up to four digits and only integers. Scientific notation can only be used in decimal. To enter 1.23E-56 in scientific notation, you should do this: first input 1.23, then click the "Exp" button, "1.23e 0" appears, click the "/-" button to the positive sign in front of the "0" Change the negative sign, then enter "56" Serve. Of course, we can also enter a number directly, and then click the "F-E" button to switch to the scientific notation form.

III. Calculation example

1. Factorial

Enter the value to be calculated and click the “n!” button, such as 5n!=120.

2. Index and logarithmic operations

Calculate the y power of x. For example, to calculate the 4th power of 2, first enter 2, click the "x^y" button, then enter 4, and finally click "=" to get the result to be 16. Square and cubic operation buttons are also provided directly on the panel. Select "Inv" and perform such an operation to calculate the y-th root of x. Enter the value to be calculated, click “log” to calculate the common logarithm of base 10; click “ln” to calculate the natural logarithm of base e. Select "Inv" and perform such an operation to calculate the xth power of 10 or the power of x of e.

3. Trigonometric Function

You can directly calculate sine, cosine, and tangent, select "Inv", and then perform such an operation to calculate the inverse sine, arccosine, and arctangent. For example, to calculate the value of sin30°, you should do this: Enter 30 in decimal and angle mode, then click the “sin” button to get the result value of 0.5.

Since tangent and cotangent are reciprocal, if you want to calculate the cotangent, first calculate the tangent, then click the “1/x” button to get the cotangent value.