说明：  用C语言实现在1 2 3 4 5 6 7 8 9 = 110之间插入加号或者减号使等式成立。他们之间如果不插入符号，那么符号之间的数字合并成一个数字。
(Implemented in C language in 1 2 3 4 5 6 7 8 9 inserted between = 110 plus or minus sign, the expression was established. Between them if the number is not the caret is digital merged into a number.)