Helpful guidelines

How do I print boolean in NSLog?

How do I print boolean in NSLog?

There is no format specifier to print boolean type using NSLog. One way to print boolean value is to convert it to a string. Another way to print boolean value is to cast it to integer, achieving a binary output (1=yes, 0=no).

What does %d mean in string format?

decimal integer
%d is for decimal integer. %s is for generic string or object and in case of object, it will be converted to string. Consider the following code name =’giacomo’ number = 4.3 print(‘%s %s %d %f %g’ % (name, number, number, number, number))

How do I print a string in Objective C?

NSString *name = [NSString stringWithUTF8String:name]; NSLog(@”%@”, name); %@ works for all Objective-C objects. If you want to output a C-string ( char* or const char* ), use %s . Never put a non-literal string as the first argument to NSLog as this opens security holes.

How do I append to NSString?

The format specifier “%@” is used to insert string values. The example below uses a combination of whitespace and %@ format specifiers to append two strings to string1: NSString * string3 = [string1 stringByAppendingFormat:@” %@ %@”, string2, @”A third string.

What is %f in C programming?

%f. a floating point number for floats. %u. int unsigned decimal.

Why do we use d in C?

In C programming language, %d and %i are format specifiers as where %d specifies the type of variable as decimal and %i specifies the type as integer. In usage terms, there is no difference in printf() function output while printing a number using %d or %i but using scanf the difference occurs.

What is difference between string and NSString in Swift?

The Swift string is one character long, as expected. The NSString says it has a length of seven — this matches with the length of the Swift string’s utf16 view, since NSStrings are backed by UTF-16: 09:02 The Swift string’s unicodeScalars view returns a count of four.