#import <Foundation/Foundation.h>  
int main (int argc, const char *argv[]) {    
    int score=0;
    scanf("%i",&score);
    int scoreVal=score/10;
    char resChar=' ';
    switch(scoreVal){
        case 9:
            resChar='A';
            break;
        case 8:
            resChar='B';
            break;
        case 7: 
            resChar='C';
            break;
        default:
            resChar='F';
    }
    NSLog(@"你的分数是:%cfdsaaaaadsffdssfd",resChar);
  return 0; 
 }   

#import <Foundation/Foundation.h> 
#import "Song.h"
int main(int argc, const char *argv[])
{
    NSAutoreleasePool *pool=[[NSAutoreleasePool alloc] init];
    
    Song *mySong=[[Song alloc] init];
    mySong->title=@"my love";
    
    [mySong release];
    NSLog(@"Hello,world!");
    
    [pool drain];
    return 0;
}