The words that are part of the slandered C language library are called reserved words. Those reserved words have special meaning and it is not possible to use them for any activity other than its intended functionality. Example void, return int.

Break can appear only with in the looping control and switch statement. The purpose of the break is to bring the control out from the said blocks.

There are two possible methods to perform this task. 1) Use increment (++) and decrement (-) operator. Example When x=4, x++ returns 5 and x- returns 3. 2) Use conventional + or – sign. When x=4, use x+1 to get 5 and x-1 to get 3.

Memory leak occurs when programmers create a memory in heap and forget to delete it. Memory leaks are particularly serious issues for programs like daemons and servers which by definition never terminate. #include <stdlib.h> void f() { int* ptr = (int*)malloc(sizeof(int)); return; /* Return without… Read More »What is memory leak? Why it should be avoided.

Dangling Pointer is a pointer that doesn’t point to a valid memory location. Dangling pointers arise when an object is deleted or deallocated, without modifying the value of the pointer, so that the pointer still points to the memory location of the deallocated memory. Following… Read More »What is Dangling pointer?

The mistakes when creating a program called syntax errors. Misspelled commands or incorrect case commands, an incorrect number of parameters when called a method /function, data type mismatches can identify as common examples for syntax errors.

By default every local variable of the function is automatic (auto). In the below function both the variables ‘i’ and ‘j’ are automatic variables. void f() { int i; auto int j; } NOTE − A global variable can’t be an automatic variable.

Int – Represent the number (integer) Float – Number with a fraction part. Double – Double-precision floating-point value Char – Single character Void – Special purpose type without any value.

Both allocates memory from heap area/dynamic memory. By default calloc fills the allocated memory with 0’s

It’s a pointer variable which can hold the address of another pointer variable. It de-refers twice to point to the data held by the designated pointer variable. Eg: int x = 5, *p=&x, **q=&p; Therefore ‘x’ can be accessed by **q.