1, "c" key: stands for "clear" and refers to the clear key. When the "C" key is pressed, the calculator will clear the current single input value, but it will not clear all the numbers or some special values in the memory.

2. "AC" key: stands for "clear all" and refers to the clear all key. When the "AC" key is pressed, the calculator will clear all the numbers or special values that have been input into the memory and return the calculator to the initial state.

These two keys are usually located in the center of the calculator, which is convenient for users to operate. The function of the calculator error correction key is to help the user to correct the wrong input more conveniently. In complex calculations, input errors are inevitable. At this time, using "C" or "AC" key can quickly correct errors and improve the accuracy and efficiency of calculation.

Introduction to calculator:

1. calculator is a portable electronic computing device, which is usually used for simple mathematical calculation. There are many kinds of calculators, including simple four arithmetic calculators, scientific calculators, financial calculators and so on. Calculators usually consist of numeric keys, operation keys, clear keys, sign change keys, equal sign keys, decimal points keys, etc. , and is equipped with a display screen to display numbers and results.

2. The basic calculator can perform some simple arithmetic operations, while the scientific calculator has more functions, such as trigonometric function, logarithm, exponent, inverse matrix and other advanced mathematical calculations. In modern society, calculators have become one of the indispensable tools in our daily life and are widely used in education, business and science.