删除字符串前后的空格

#include <iostream>

#include <string>

using namespace std;

string trim(string str);

int main()

{

string name(" wei ");

cout << name<<endl;

name = trim(name);

cout << name<<endl;

return 1;

}

string trim(string str)

{

int len = (int)str.length();

//分配空间+赋值

char *tempstr = new char[len+1];

memset(tempstr, 0, len+1);

memcpy(tempstr, str.c_str(), len);

char *src = tempstr;

////去掉字符串前面的空格

while ( *src != '\0')

{

if ( *src ==' ' || *src == '\t' )

{

src++;

}

else

{

break;

}

}

int count = strlen(src);

int i = count;

//去掉字符串后面的空格

for (int j= count-1; j> 0; j-- )

{

if ( src[j] != '\t' && src[j] != ' ')

{

break;

}else

{

i = j;

}

}

if( src[i] !='\0')

{

src[i] = '\0';

}

string s(src); //string 构造函数

delete tempstr;

tempstr = NULL;

return s;

}