#include 
       
        #include 
        
         using namespace std; //转string模板函数template 
         
          string toString(const T &v){    ostringstream os;    os << v;    return os.str();}int main() {      int a = 4;    float aa = 4.01;    double dd = 33.566;    string straa = toString(a);    string straaa = toString(aa);    string straab = toString(dd);    cout << straa << endl;    cout << straaa << endl;    cout << straab << endl;    return 0; }
         
        
       

 

　　

int writeFile(string charFpName, string chVal) //写文件{		FILE *fp = fopen(charFpName.c_str(),"w+");	if(NULL == fp){				return 0;	}		fprintf(fp,"%s\n",chVal.c_str());	fclose(fp);	return 1;	}