Slide 1:Data Types: Integer - without decimal Float - with decimal Character - Character / key words Constants: Constants in C referred to fixed values that do not change during the execution of the program. Variables: Variables is a data name that may be used to store a data value at different times during execution


Slide 2:Range of Size: 8 bits - 1 bytes 1024 byte - 1 KB 1024 KB - 1 MB 1024 MB - 1 GB Int - 2 byte Char - 1 byte Float - 4 byte If we given size of int the output will be given as 2


Slide 3:Basic structure of C program: Documentation section Link section Definition section Global Declaration section main() { declaration part execution part }


Slide 4:Subprogram section Fun 1 Fun 2 ……. …….. User define function ……. Fun n


Slide 5:Document section: It is a non-executable part used to refer the program. Eg: / * addition of two numbers * / Link section: It provides the instruction to the compiler to link function from system library. Eg: #include main() { printf(“hello”); }


Slide 6:Definition section: Eg: #include #define .PI 3.14 ------- definition part main() { int I,j; i=5; j=i*PI; printf(“ The value of J is %d”,j); }


Slide 7:Global declaration section: There are some variable that are used more than one function such variable are called Global variables and are declared in global declaration section Main: It is a declaration part. Declaration part: It declares all variables used in a executable part Executable part: There must be atleast one statement in executable part. These two parts must be appear between (or) begins with { and ends with }. All statement should end with; (semicolon) Sub program section: It contains all the user defined function that are called in the main function.


Slide 8:Scanf: Sample program: #include main() { int a,b,c; printf(“Enter the value of a:”); scanf(“%d”),&a); printf(“Enter the value of b:”); scanf(“%d”,&b); c=a+b; printf(“The value of c is %d”,c); }


Slide 9:Information: A programming language is designed to help process certain kinds of data consisting of numbers, characters, strings and to provide useful output. Program: Task of processing of data is accomplished by executing a precise instructions Character set: Character that can be used to form word, numbers and expressions. The character set in c is grouped into the following categories. Letters, digits, special characters, white space. White space may be used to separate words but are prohibited between character of keywords and identifiers


Slide 10:Trigraph character: Many not english keywords do not support all the characters mention in character set. C introduce a concept of Trigraph sequence that are not available on some keywords. Each Trigraph sequences consist of three characters. C two question mark followed by another character Eg: [ -??c]