计算器编写，该科学计算器具有以下功能：

①运算功能：加、减、乘、除、求模、位异或、位与、位或、位非、正弦、反正弦、余弦、反余弦、正切、反正切、开方、开三次方、平方、倒数、均值、平方和、方差、标准差、阶乘、log2(x)、lg(x)、ln(x)、10x、2x、ex、(1+…+n)、xy、x(1/y)。

②进制转换功能：要求能在二进制、八进制、十进制、十六进制之间进行任意的转换；能在任意进制下进行正数的加、减、乘、除、求模、位异或、位与、位或、位非运算。

③输入功能：可清零、退格，可一键输入pi和e的值。

-Calculator to write the scientific calculator has the following features: ① arithmetic functions: addition, subtraction, multiplication, division, modulo, bit XOR bit with the bit or bit non-sine, arc sine, cosine, inverse cosine, tangent, arctangent, square root, open cubic, quadratic, reciprocal, mean, sum of squares, variance, standard deviation, factorial, log2 (x), lg (x), ln (x), 10x, 2x, ex, ( 1+ ...+n), xy, x (1/y). ② hex conversion function: requires energy in the binary, octal, decimal, conversion between arbitrary hexadecimal　capable in any positive number of decimal addition, subtraction, multiplication, division, modulo, bit XOR , the bit with the bit or bit non-operational. ③ Input Function: can be cleared, backspace, can be a key to enter the value of pi and e.