Golang | Leetcode Golang题解之第227题基本计算器II

题目：

题解：

func calculate(s string) (ans int) {stack := []int{}preSign := '+'num := 0for i, ch := range s {isDigit := '0' <= ch && ch <= '9'if isDigit {num = num*10 + int(ch-'0')}if !isDigit && ch != ' ' || i == len(s)-1 {switch preSign {case '+':stack = append(stack, num)case '-':stack = append(stack, -num)case '*':stack[len(stack)-1] *= numdefault:stack[len(stack)-1] /= num}preSign = chnum = 0}}for _, v := range stack {ans += v}return
}