去掉string中的空格

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void str(char * a)
{
char *toks = " ";
char * tok = strtok(a, toks);
while (tok)
{
  if (tok == a)
   strcpy(a, tok);
  else
   strcat(a, tok);
  tok = strtok(NULL, toks);
}
}

int main()
{

string b = "this is a dog";
str(const_cast<char*>(b.c_str()));
cout<<b;

return 0;
}

#include <iostream> 　　#include <cstring> 　　using namespace std;int main() { char sentence[]="This is a test with strtok"; char *tokenPtr=strtok(sentence," "); while(tokenPtr!=NULL) { cout<<tokenPtr; tokenPtr=strtok(NULL," "); } getchar();return 0;} #include <iostream>#include <string>using namespace std;void Delete(char * a){char * tok = strtok(a, " ");while (tok!=NULL){if (tok == a)strcpy(a, tok);elsestrcat(a, tok);tok = strtok(NULL, " ");}}int main(){char sentence[]="This is a test with strtok"; Delete(sentence);cout<<sentence;getchar();return 0;}

#include <stdio.h>
#include <string>
#include <iostream>
using namespace std;

string DelNull(string str)
{
char *buf=const_cast<char*>(str.c_str());
char *token;
string strData;
while ((token = strsep(&buf, " ")) != NULL)
strData += token;
return strData;
}

int main(void)
{
string str = " root x艾迪 0 root /root /bin/bash ";
cout<<DelNull(str);
return 0;
}

扩展内容：

http://www.cnblogs.com/longzhao1234/archive/2012/05/31/2528317.html