Objective-C and if , else if , switch Flow Condition Statement (iOS,iPhone,iPad)

if (boolean expression) {
// Statement
}

    int x = 10;
    if (x == 10)
    {
        NSLog (@ "True x = %i" , x);
    }

if (boolean expression) {
// Statement True
else
{
// Statement False
}

    int x = 8;
    
    if ( x > 10 )
    {
        NSLog (@"%i is more than 10",x);
    }
    else
    {
        NSLog (@"%i is less than 10",x);
    }

if (boolean expression) {
// Statement condition is true
}
else if (boolean expression) {
{
// Statement condition is true
}
else if (boolean expression) {
{
// Statement condition is true
}
else
{
// Statement False
}

    int x = 3;
    
    if ( x == 1 )
    {
        NSLog (@"%i is equal 1",x);
    }
    else if( x == 2 )
    {
        NSLog (@"%i is equal 2",x);
    }
    else if( x == 3 )
    {
        NSLog (@"%i is equal 3",x);
    }
    else if( x == 4 )
    {
        NSLog (@"%i is equal 4",x);
    }
    else if( x == 5 )
    {
        NSLog (@"%i is equal 5",x);
    }
        else
    {
        NSLog (@"%i not have in condition",x);
    }

    int x = 75;
    
    if ( x >= 90 && x <= 100 )
    {
        NSLog (@"Grade A");
    }
    else if( x >= 80 && x <= 89 )
    {
        NSLog (@"Grade B");
    }
    else if( x >= 70 && x <= 79 )
    {
        NSLog (@"Grade C");
    }
    else if( x >= 60 && x <= 69 )
    {
        NSLog (@"Grade D");
    }
    else
    {
        NSLog (@"Grade F");
    }

    switch (expression)
    {
        case expression 1 :
            statement
            break;
        case expression 2 :
            statement
            break;
        case expression n :
            statement
            break;
        default:
      }

    int x = 3;
    
    switch (x)
    {
        case 1 :
            NSLog (@"%i is equal 1",x);
            break;
        case 2 :
            NSLog (@"%i is equal 2",x);
            break;
        case 3 :
            NSLog (@"%i is equal 3",x);
            break;
        case 4 :
            NSLog (@"%i is equal 4",x);
            break;
        case 5 :
            NSLog (@"%i is equal 5",x);
            break;
        default:
            NSLog (@"%i not sent condition",x);
    }