Basic Syntax - Objective C
You have seen a basic structure of Objectiv-C program, so it will be easy to understand other basic building blocks of the Objective-C programming language.
Tokens in Objectiv-C
A objective-c program, consist of various tokens and a token is either a keyword, an identifier, a constant, a string literal, or a symbol. For example, the following Objective-c statement consist of six tokens:
NSLog(@"Hello my Friends");
The individual tokens are:
NSLog
( @ "Hello my friends"
)
;
Semicolons:
In Objective-c program, the semicolon is a statement terminator. That is, each individual statement must be ended with a semicolon. It indicates the end of one logical entity.
For example, following are two different statements:
NSLog(@"Hello guys \n");
return 0;
Comments
Comments are like helping text in your Objective-C program and they are ignored by the compiler. They start with /* and terminate with the character */ as shown below:
/* my first program in objective-c */
You can not have comments with in comments and they do not occur within a string or character literals.
Identifiers
An objective-c identifier is a name used to identify a variable,function, or any other user-defined item. An identifier start with a letter A to Z or an underscore _ followed by zero or more letters,underscores and digits.(0 to 9)
Objectve-c does not allow punctuation character such as @, $, and % within identifiers. Objective-c is a case-sensetive programming langauge. Thus Manpower and manpower are two different identifier in objective-c. Here are some example of acceptable identifiers.:
mohd zara abc move_name a_123
myname50 _temp j a23b9 ratValue
Keywords
The reserved wordes may not be used as constant or variable or any other identifier names.
Whitespace in Objective-C
A line containing only whitespace, possibly with a comment, is known as blank line, and an Objective-c compiler totally ignores it.
Whitespace is the term used in Objetive-c to describe blanks, tabs, newline character and comments. Whitespace separates one part of a statement from another and enables the compiler to identify where one element in a statatemen,such as int,ends the next element begins.Therefore , in the following statement.:
int age;
There must be at least one whitespace character between int and age for the compiler to be able to distinguish them.The following statement,
fruit = apples + oranges; //get the total fruit
no whitespace character are necessary between fruit and =, or between = and apples, although you are free to include some if you wish for readability puepose.
Tokens in Objectiv-C
A objective-c program, consist of various tokens and a token is either a keyword, an identifier, a constant, a string literal, or a symbol. For example, the following Objective-c statement consist of six tokens:
NSLog(@"Hello my Friends");
The individual tokens are:
NSLog
( @ "Hello my friends"
)
;
Semicolons:
In Objective-c program, the semicolon is a statement terminator. That is, each individual statement must be ended with a semicolon. It indicates the end of one logical entity.
For example, following are two different statements:
NSLog(@"Hello guys \n");
return 0;
Comments
Comments are like helping text in your Objective-C program and they are ignored by the compiler. They start with /* and terminate with the character */ as shown below:
/* my first program in objective-c */
You can not have comments with in comments and they do not occur within a string or character literals.
Identifiers
An objective-c identifier is a name used to identify a variable,function, or any other user-defined item. An identifier start with a letter A to Z or an underscore _ followed by zero or more letters,underscores and digits.(0 to 9)
Objectve-c does not allow punctuation character such as @, $, and % within identifiers. Objective-c is a case-sensetive programming langauge. Thus Manpower and manpower are two different identifier in objective-c. Here are some example of acceptable identifiers.:
mohd zara abc move_name a_123
myname50 _temp j a23b9 ratValue
Keywords
The reserved wordes may not be used as constant or variable or any other identifier names.
Whitespace in Objective-C
A line containing only whitespace, possibly with a comment, is known as blank line, and an Objective-c compiler totally ignores it.
Whitespace is the term used in Objetive-c to describe blanks, tabs, newline character and comments. Whitespace separates one part of a statement from another and enables the compiler to identify where one element in a statatemen,such as int,ends the next element begins.Therefore , in the following statement.:
int age;
There must be at least one whitespace character between int and age for the compiler to be able to distinguish them.The following statement,
fruit = apples + oranges; //get the total fruit
no whitespace character are necessary between fruit and =, or between = and apples, although you are free to include some if you wish for readability puepose.
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