```
int main(int argc, const char * argv[]) {
@autoreleasepool {
// insert code here...
NSString *S=@"JACK"; #OC字符串定义
NSLog(@"Hello, World! %@",S); #占位符%@
}
return 0;}
```
int main(int argc, const char * argv[]) {
@autoreleasepool {
// insert code here...
NSString *S=@"JACK"; #OC字符串定义
NSLog(@"Hello, World! %@",S); #占位符%@
}
return 0;}