✔ C-LANGUAGE CHAPTERS:-
1. C-Introduction
2. C-Constants
3. C-Basic Programs
4. C-Instructors
5. C-Operators
6. C-If Else Statement
7. C-Loop Contructs
8. C-Nesting Of Loops
9. C-Programming Examples
10. C-Functions
11. C-Functions Naming Convention
12. C-Pointers
13. C-Arrays
14. C-Arrays & Functions
15. C-Strings
16. C-Structures
17. C-Union
18. C-Storage Classes
19. C-PreProcessor
20. C-Header Files
21. C-R/W one Line
22. C-Accessing Random File
23. C-Important Point
24. C-Interview Questions
1. C-Introduction
2. C-Constants
3. C-Basic Programs
4. C-Instructors
5. C-Operators
6. C-If Else Statement
7. C-Loop Contructs
8. C-Nesting Of Loops
9. C-Programming Examples
10. C-Functions
11. C-Functions Naming Convention
12. C-Pointers
13. C-Arrays
14. C-Arrays & Functions
15. C-Strings
16. C-Structures
17. C-Union
18. C-Storage Classes
19. C-PreProcessor
20. C-Header Files
21. C-R/W one Line
22. C-Accessing Random File
23. C-Important Point
24. C-Interview Questions
- Whenever C program is executed, main( ) is executed. No main( ) means no execution.
- In conditional if else branching if we have a single statement to write after if or else then braces are not needed.
E.g.:
o if(number % 2 == 0)
- printf(“Number is Even”);
o else
- printf(“Number is Odd”);
- It is convention to write brackets of blocks in a sequence, so that it looks good and errors can be easily traced.
- With a single ‘if’ block we can have multiple else block, but only one will get executed.
- In if else if ladder, all relational operators are allowed.
- Variables take a memory in scattered form.
- If the conventions of the identifiers are not followed then it will generate an Error.
- %i can also be used at place of %d.
- Numbers that have decimal portions are called Real numbers.
- All statements of a program should be written in lower case.
- At the place of void main( ), we can write main( ) only but the “return 0” statement is compulsory to be written at the end of all statement but before curly braces.
- main( ) is a user defined function.
- To find out name of header file of a pre defined function hen place the cursor under function name and press Ctrl+f1.
- By default the return data type of main( ) is ‘int’.
- By default all variables are initialized with some garbage value.
- Unsigned int can only store positive value.
- If loop does not contain any statements in its body then it is said to Empty loop.
- Multiple increment/decrement expression in for loop can be separated by comma.
- Multiple break statements can be used in a single block of loop.
- while(1) is used for infinite loop.
- break is premature loop termination.
- exit( ) function forces exit from a program.
- char data type can take symbol as input.
- All characters are represented internally as integer in c programming.
- Nesting of while loop can be done up to 3 levels.
- The increment/decrement in loops can be written as i = i + 1 as i++;
- Address of first byte us often known as base address.
- Address of any variable is always unsigned and range from 0 to 65535.
- Basically pointer does not have its own data type. But unsigned int can be sat its data type.
- Arithmetic operation on pointer is called Scaling.
- Dereferencing operator is unary operator.
- Nesting of pointer can be till infinity.
- Comparison of pointer variables can also be performed but they must point to same object.
- Pointers are mainly used for dynamic memory allocation and it reduces the length and complexity of a program.
Important Points in Pointers:
- a[i] as same as *(a+i).
- a[0]+I same as (*a)+i.
- int (*p)[10] is array of pointer variable p and store s 10 elements in array.
- Pointer is not integer, so multiplication with another pointer is not allowed.
- putchar() is used to display a single character on console.
- Drawback of array that array can’t b e resized.
- The difference between arr[5] and arr[5]=10 is first an array name with size and second is particular element means at 5th index awe are assigning element 10 to array.
- In definition of array, [ ] brackets are only used, ( ) brackets are error not allowed in C.
- “M” is string but ‘m ‘ is a character.
- When char variable written with “%d” then it will display ASCII value of that particular character.
- Char charcter[][3]={{‘m’,’a’,’n’},{‘I’,’a’,’f’}}; is valid syntax.
- Union can be a member of an structure.
- ‘ -> ‘ operator is used to access member of structure that is itself a member of another structure.
- Structure always pass to function by call by value mechanism.
- No limit of nesting of structure are defined in C language programming.
- ptr is pointer variable to structure then ptr->ptr is same as (*ptr).
