c++中字符数组与字符串的转换

#include <iostream>
#include <string>
using namespace std;

int main(){
char a[10]="aaaabbbba";
string s(&a[0],&a[strlen(a)]);
cout<<s<<endl;
system("pause");
}

#include <iostream>
#include <string>
using namespace std;

int main(){
string s="aaaavvva";
char a[10];
strncpy(a,s.c_str(),s.length());

for(int i=0;i<10;i++)
cout<<a[i]<<" ";
cout<<endl;
system("pause");
}

 

#include<iostream>
using namespace std;

int main()
{
char a='1';
int x;
x=atoi(a);

cout<<x<<endl;
getchar();
return 0;
}