C++ 删除空格
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C++ remove whitespace
提问by tr0yspradling
I have this code to remove whitespace in a std::string and it removes all characters after the space. So if I have "abc def" it only returns "abc". How do I get it to go from "abc def ghi" to "abcdefghi"?
我有这个代码来删除 std::string 中的空格，它删除空格后的所有字符。所以如果我有“abc def”，它只返回“abc”。我如何让它从“abc def ghi”变成“abcdefghi”？
#include<iostream>
#include<algorithm>
#include<string>
int main(int argc, char* argv[]) {
std::string input, output;
std::getline(std::cin, input);
for(int i = 0; i < input.length(); i++) {
if(input[i] == ' ') {
continue;
} else {
output += input[i];
}
}
std::cout << output;
std::cin.ignore();
}
回答by Ry-
The issue is that cin >> inputonly reads until the first space. Use getline()instead. (Thanks, @BenjaminLindley!)
问题是cin >> input只能读取到第一个空格。使用getline()来代替。（谢谢，@BenjaminLindley！）
回答by Vijay
Well the actual problem you had was mentioned by others regarding the cin >>But you can use the below code for removing the white spaces from the string:
好吧，其他人提到了您遇到的实际问题，cin >>但您可以使用以下代码从字符串中删除空格：
str.erase(remove(str.begin(),str.end(),' '),str.end());
回答by Jerry Coffin
Since the >>operator skips whitespace anyway, you can do something like:
由于>>运算符无论如何都会跳过空格，因此您可以执行以下操作：
while (std::cin>>input)
std::cout << input;
This, however, will copy the entire file (with whitespace removed) rather than just one line.
但是，这将复制整个文件（删除空格）而不仅仅是一行。
回答by Aleksandar
My function for removing a character is called "conv":
我删除字符的函数称为“conv”：
#include <cstdlib>
#include <iostream>
#include <string>
using namespace std;
string conv(string first, char chr)
{
string ret,s="x";
for (int i=0;i<first.length();i++)
{
if (first[i]!=chr)
s=s+first[i];
}
first=s;
first.erase(0,1);
ret=first;
return ret;
}
int main()
{
string two,casper="testestestest";
const char x='t';
cout<<conv(casper,x);
system("PAUSE");
return 0;
}
You need to change the const char xto ' '(whitespace, blanco) for the job to be done. Hope this helps.
您需要将const char xto ' '(whitespace, blanco)更改为要完成的工作。希望这可以帮助。
回答by Vyas Ramankulangara
ifstream ifs(filename);
string str, output;
vector<string> map;
while (getline(ifs, str, ' ')) {
map.push_back(str);
}
for(int i=0; i < map.size();i++){
string dataString = map[i];
for(int j=0; j < dataString.length(); j++){
if(isspace(dataString[j])){
continue;
}
else{
output +=dataString[j];
}
}
}
