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Chapter 2. Programming in Objective-C > Exercises
Exercises
1. | Type in and run the five programs presented in this chapter. Compare the output produced by each program with the output presented after each program. |
2. | Write a program that displays the following text: In Objective-C, lowercase letters are significant. main is where program execution begins. Open and closed braces enclose program statements in a routine. All program statements must be terminated by a semicolon. |
3. | What output would you expect from the following program? #import <Foundation/Foundation.h>
int main (int argc, const char *argv[])
{
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
int i;
i = 1;
NSLog (@"Testing...");
NSLog (@"....%i", i);
NSLog (@"...%i", i + 1);
NSLog (@"..%i", i + 2);
[pool drain];
return 0;
} |
4. | Write a program that subtracts the value 15 from 87 and displays the result, together with an appropriate message. |
5. | Identify the syntactic errors in the following program. Then type in and run the corrected program to make sure you have identified all the mistakes: #import <Foundation/Foundation.h> int main (int argc, const char *argv[]); ( NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; INT sum; /* COMPUTE RESULT // sum = 25 + 37 - 19 / DISPLAY RESULTS / NSLog (@'The answer is %i' sum); [pool drain]; return 0; } |
6. | What output would you expect from the following program? #import <Foundation/Foundation.h>
int main (int argc, const char *argv[])
{
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
int answer, result;
answer = 100;
result = answer - 10;
NSLog (@"The result is %i\n", result + 5);
[pool drain];
return 0;
} |
