版权声明：原创勿转 https://cloud.tencent.com/developer/article/1412888
思路
先处理符号
注意越界问题
code
代码语言：javascript复制func myAtoi(str string) int {
pos := 1
res := 0
str = strings.TrimSpace(str)
if len(str) == 0 {
return res
}
i := 0
if str[i] == ' ' {
i
pos = 1
} else if str[i] == '-' {
i
pos = -1
}
for ; i < len(str); i {
if pos*res >= math.MaxInt32 {
return math.MaxInt32
}
if pos*res <= math.MinInt32 {
return math.MinInt32
}
if str[i] < '0' || string(str[i]) > "9" {
return res * pos
}
res = res*10 int(str[i]) - '0'
}
if pos*res >= math.MaxInt32 {
return math.MaxInt32
}
if pos*res <= math.MinInt32 {
return math.MinInt32
}
return pos * res
}
