std::string mystr1 = "cocos"
std::string mystr2 = "d-x"
char str[10];
int num = 2;
sprintf(str,"%d",num);
mystr1 = mystr1 + str + mystr2;
std::string mystr1 = "cocos"
std::string mystr2 = "d-x"
char str[10];
int num = 2;
sprintf(str,"%d",num);
mystr1 = mystr1 + str + mystr2;