Property in Swift - Computed property | Property Observers (WillSet & DidSet)

   Computed property -  Computed properties are part of a property type in Swift.  Stored properties are the most common which save and return a stored value  Computed properties calculate (rather than store) a value. A computed property provides a getter and an optional setter to indirectly access other properties and values. Computed property in swift is an interesting topic as you can write code inside a property in swift. Computed properties are provided by classes, structures, and enumerations but stored properties are provided only by classes and structures. This computed property swift tutorial has some tips on how to use the computed property in the right way and avoid the common mistakes that swift programming beginners do while computed property. Example :- Computed property A Calculate Simple Intrest struct CalculateLoan {      var amount : Int      var rate : Int      var years : Int      var simpleInterest: Int {          get {              return ( amount * rate

Program Objective-C

1 - A Program in Objective C Method Function Declaration, Definition With Calling.

#import <Foundation/Foundation.h>

@interface SampleClass: NSObject

-(int)max:(int)num1 secondNumber:(int)num2;

@end

@implementation SampleClass

-(int)max:(int)num1 secondNumber:(int)num2
{
int result;
if(num1 > num2)
{
result = num1;
}
else{
result = num2;
}
return result;
}
@end

//Variable declaration
int a;
int b;
int main()
{
//Variable defination
int a = 10;
int b = 20;
int c;
int ret;
c = a + b;
NSLog(@"Value of c : %d \n", c);
f = f/10.10;
NSLog(@"Value of c : %f \n", f);
SampleClass *sampleClass = [[SampleClass alloc]init];
ret =  [sampleClass max:a secondNumber:b];
NSLog( @"Max value is :%d\n", ret );

return 0;

}

Object Oriented Programming Feature in Swift


Classes and Objects

Create A Class 

Class A{
//Empty Class
}
Create a new instance new Object in a Class A
Class A{
var new = A()
}

Properties 

Class B{

var data: Int = 10

}

1 TO 5 - Number Pattern Program in Objective C

(1):- 

12345
1234
123
12
1

#import <Foundation/Foundation.h>
int main (int argc, const char * argv[])

{

NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

int i, j;    
    for(i=5; i>=1; i--)  
{
   for(j=1; j<=i; j++)      
 {          
         NSLog(@"%i", j);    
    }      
         NSLog(@"");
   
}
[pool drain];
return 0;
}

(2):- 

5
54
543
5432
54321


#import <Foundation/Foundation.h>
int main (int argc, const char * argv[])
{

NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
int i, j;  
for(i=5; i>=1; i--)
        {  
for(j=5; j>=i; j--)    
{        
NSLog(@"%i", j);    
}      
NSLog(@"");  
}
[pool drain];
return 0;
}

(3):- 

54321
4321
321
21
1

#import <Foundation/Foundation.h>
int main (int argc, const char * argv[])
{

NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
int i, j;  
for(i=5; i>=1; i--)
 {      
for(j=i; j>=1; j--)
          
NSLog(@"%i", j);      
}
       
NSLog(@"");
   
}

[pool drain];
return 0;
}

(4):- 

54321
5432
543
54
5

#import <Foundation/Foundation.h>
int main (int argc, const char * argv[])
{

NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
int i, j;
   
for(i=5; i>=1; i--)
   
 {
       
for(j=i; j>=1; j--)          
NSLog(@"%i", j);
     
}
       
NSLog(@"");
   
}
[pool drain];

return 0;
}

(5):- 

5
45
345
2345
12345

#import <Foundation/Foundation.h>


int main (int argc, const char * argv[])

{

NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

int i, j;
   
for(i=5;i>=1;i--)
   
  {
       
for(j=i;j<=5;j++)
       
{          
NSLog(@"%d", j);
       
  }
       
NSLog(@"");
   
 }
 

[pool drain];

return 0;

}



(6):-

1
21
321
4321
54321

#import <Foundation/Foundation.h>


int main (int argc, const char * argv[])

{

NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];


for(i=1;i<=5;i++)

 {

for(j=i;j>=1;j--)

 {                  
NSLog(@"%d", j);
       
  }
       
NSLog(@"");
   
 }
 

[pool drain];

return 0;

}


(7):-

5
54
543
5432
54321

#import <Foundation/Foundation.h>


int main (int argc, const char * argv[])

{

NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];


for(i=5;i>=1;i--)
{

for(j=5;j>=i;j--)

{                
NSLog(@"%d", j);
       
  }
       
NSLog(@"");
   
 }
 

[pool drain];

return 0;

}


(8):-

1
22
333
4444
55555

#import <Foundation/Foundation.h>


int main (int argc, const char * argv[])

{

NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];


for(i=1;i<=5;i++)

{

for(j=1;j<=i;j++)

{                
NSLog(@"%d", j);
       
  }
       
NSLog(@"");
   
 }
 
[pool drain];

return 0;



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