英文:
Parsed strings sometimes becomes 0
问题
我在将字符串解析为整数时遇到了一个问题，有时候字符串被解析为0，尽管它不是0。
示例：
首先，我想将一个字符串解析为三个不同的整数。我的代码如下：
package main
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
)
func main() {
reader := bufio.NewReader(os.Stdin)
line, _ := reader.ReadString('\n')
splitted := strings.Split(line, " ")
N, _ := strconv.ParseInt(splitted[0], 0, 64) //按预期工作
P, _ := strconv.ParseInt(splitted[1], 0, 64) //按预期工作
Q, _ := strconv.ParseInt(splitted[2], 0, 64) //不按预期工作
fmt.Print(N, P, Q) //用于测试解析结果
}
如果我输入字符串："5 25 125"，输出结果却变成了：
5 25 0。
这就是问题所在，有时候解析将整数解析为字符串的内容，这是正确的。但有时候它将整数解析为零。
为什么会这样呢？
英文:
I have a problem when parsing from a string to an integer that sometimes the string is being parsed to 0, despite not being 0.
Example:
What I would like to do first is parsing a string into three different integers. My code looks as follows:
package main
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
)
func main() {
reader := bufio.NewReader(os.Stdin)
line, _ := reader.ReadString('\n')
splitted := strings.Split(line, " ")
N, _ := strconv.ParseInt(splitted[0], 0, 64) //Works as intended
P, _ := strconv.ParseInt(splitted[1], 0, 64) //Works as intended
Q, _ := strconv.ParseInt(splitted[2], 0, 64) //Does not work as intended
fmt.Print(N, P, Q) //For testing the parsing
}
If I input the string: "5 25 125", the output somehow becomes:
5 25 0.
This is the problem, sometimes the parsing parses the integer to the content of the string, which it should. But sometimes it parses the integer into a zero.
Why is this?
答案1
得分: 3
ReadString函数会读取输入直到遇到第一个分隔符（delim），并返回包含分隔符在内的数据字符串。
所以splitted[2]的值是125\n，你应该检查strconv.ParseInt(splitted[2], 0, 64)中的错误，如果不是nil，那么返回的值就是0。
英文:
> ReadString reads
> until the first occurrence of delim in the input, returning a string
> containing the data up to and including the delimiter.
So splitted[2] is 125\n, you should check the error in strconv.ParseInt(splitted[2], 0, 64), it's not nil so that the returned value is 0.
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