Objective-C 程式設計（第六版）第二章習題答案

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1.略

2.

#import <Foundation/Foundation.h>int main(int argc, const char * argv[]){    @autoreleasepool {                // insert code here...       NSLog(@"In Obiective-c, lowercase letters are significance .\n main is where program execution begins.\n Open and closed brace enclose program stateme               nts in a routine .\n All program statements must be terminated by a semicolon .");

       }

    return 0;

  }

3.

    testing...

    .... 1

    ... 2

    .. 3

4. 

 int value1, value2, sum;        
 value1 = 87; value2 = 15; sum = value1 - value2; NSLog(@"sum is %i", sum);

5.改正後的程式

  int sum;                               <---原文INT改為int.
  /* COMPUTE RESULT*/                    <---原文右注釋號//改為*/.  sum = 25+37-19;                        <---原文後加分號結束.  /* DISPLAY RESULTS*/                   <---原文注釋號改為/*..*/或//.  NSLog(@"The answer is %i",sum);        <---原文改為雙引號，加上sum前的逗號.

6.

  The result is 95.

 

 

END

Objective-C 程式設計（第六版）第二章習題答案