"字符减去数字"...字符减去数字
"字符1减字符0"...字符1减字符0
"字符减去0"...字符减去0
"字符数怎么减"...字符数怎么减
"字符2减字符0"...字符2减字符0
"数字字符相减"...数字字符相减
"字符9减字符0"...字符9减字符0
"字符减去'0'"...字符减去'0'
"字符减48"...字符减48
"字符加减数字"...字符加减数字
