在C ++中删除多余的空格 [英] Remove extra white spaces in C++
问题描述
我试图编写一个脚本来删除多余的空格,但是我没有设法完成它。
I tried to write a script that removes extra white spaces but I didn't manage to finish it.
基本上我想将 abc sssd gg sdg gg gf
转换为 abc sssd gg sdg gg gf
。
在类似PHP或C#的语言中,这将非常容易,但是在C ++中却不是。这是我的代码:
In languages like PHP or C#, it would be very easy, but not in C++, I see. This is my code:
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <cstring>
#include <unistd.h>
#include <string.h>
char* trim3(char* s) {
int l = strlen(s);
while(isspace(s[l - 1])) --l;
while(* s && isspace(* s)) ++s, --l;
return strndup(s, l);
}
char *str_replace(char * t1, char * t2, char * t6)
{
char*t4;
char*t5=(char *)malloc(10);
memset(t5, 0, 10);
while(strstr(t6,t1))
{
t4=strstr(t6,t1);
strncpy(t5+strlen(t5),t6,t4-t6);
strcat(t5,t2);
t4+=strlen(t1);
t6=t4;
}
return strcat(t5,t4);
}
void remove_extra_whitespaces(char* input,char* output)
{
char* inputPtr = input; // init inputPtr always at the last moment.
int spacecount = 0;
while(*inputPtr != '\0')
{
char* substr;
strncpy(substr, inputPtr+0, 1);
if(substr == " ")
{
spacecount++;
}
else
{
spacecount = 0;
}
printf("[%p] -> %d\n",*substr,spacecount);
// Assume the string last with \0
// some code
inputPtr++; // After "some code" (instead of what you wrote).
}
}
int main(int argc, char **argv)
{
printf("testing 2 ..\n");
char input[0x255] = "asfa sas f f dgdgd dg ggg";
char output[0x255] = "NO_OUTPUT_YET";
remove_extra_whitespaces(input,output);
return 1;
}
它不起作用。我尝试了几种方法。我要尝试的是逐个字母地迭代字符串,并将其转储到另一个字符串中,只要一行中只有一个空格即可。如果有两个空格,请不要在新字符串中写入第二个字符。
It doesn't work. I tried several methods. What I am trying to do is to iterate the string letter by letter and dump it in another string as long as there is only one space in a row; if there are two spaces, don't write the second character to the new string.
我该如何解决?
推荐答案
这是一个简单的非C ++ 11解决方案,使用与问题中相同的 remove_extra_whitespace()
签名:
Here's a simple, non-C++11 solution, using the same remove_extra_whitespace()
signature as in the question:
#include <cstdio>
void remove_extra_whitespaces(char* input, char* output)
{
int inputIndex = 0;
int outputIndex = 0;
while(input[inputIndex] != '\0')
{
output[outputIndex] = input[inputIndex];
if(input[inputIndex] == ' ')
{
while(input[inputIndex + 1] == ' ')
{
// skip over any extra spaces
inputIndex++;
}
}
outputIndex++;
inputIndex++;
}
// null-terminate output
output[outputIndex] = '\0';
}
int main(int argc, char **argv)
{
char input[0x255] = "asfa sas f f dgdgd dg ggg";
char output[0x255] = "NO_OUTPUT_YET";
remove_extra_whitespaces(input,output);
printf("input: %s\noutput: %s\n", input, output);
return 1;
}
输出:
input: asfa sas f f dgdgd dg ggg
output: asfa sas f f dgdgd dg ggg
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