C programming language

C programming language

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  By Mahalakshmi. 4/17/2015
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  What is C C is a programming language  High-level programming language.  General purpose programming languages. Advantages: Readability: Programs are easy to read. Maintainability: Programs are easy to maintain. Portability: Programs are easy to port across different computer platforms. 4/17/2015
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  Writing First CProgram The basic C program Contains The #include directive Comments The main() function  The return statement The newline character (n) 4/17/2015
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  Simple C Program /*Thisis my 1st pgm*/ comment The C compiler ignores comment. The purpose of comments is used to know what the program do. #include <stdio.h> include information about standard library main() define a function called main that received no argument values { statements of main are enclosed in braces printf("hello, worldn"); main calls library function printf to print this sequence of characters. n represents the newline character } 4/17/2015
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  The main() Function Thisis a very special function in C. Every C program must have a main() function, and every C program can only have one main() function. The execution of your program always starts with the main( ) function. 4/17/2015
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  Structure of aC Program  The essentials of C program  Expressions Constants and variables  Statements  Statement blocks  C function types and names  Arguments to functions  The body of a function  Function calls 4/17/2015
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  Contd.., Expressions: An expressionis a combination of constants, variables, and operators that are used to denote computations. Constants and Variables: As its name implies, a constant is a value that never changes. A variable, on the other hand, can be used to present different values. Statements: A statement is a complete instruction, ending with a semicolon. 4/17/2015
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  Contd.., Statement Blocks: Agroup of statements can form a statement block that starts with an opening brace ({) and ends with a closing brace (}). A statement block is treated as a single statement by the C compiler. C Function: Functions are the building blocks of C programs. Besides the standard C library functions, you can also use some other functions made by you or another programmer in your C program. 4/17/2015
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  Data Types andKeywords Four data types of the C: char data type single character int data type used to specify the type of a variable as an integer. float data typefloating-point number contains a decimal point. double data typefloating-point number is of at least 10 digits of precision4/17/2015
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  C Keywords The Clanguage reserves certain words that have special meanings to the language. Those reserved words are sometimes called C keywords. You should not use the C keywords for your own variable, constant, or function names in your programs. 4/17/2015