1. Pointer to a Structure You can create a pointer that points to a structure variable. Useful when passing structures to functions or for dynamic memory allocation. Syntax:
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struct StructName *ptr; ptr = &structVariable; |
Access members using arrow ->...
1. What are Nested Structures? A nested structure is a structure that contains another structure as a member. Useful for representing complex data objects like a student with an address, or an employee with...
1. What is a Structure? A structure is a user-defined data type in C. It allows you to store multiple variables of different data types under a single name. Useful for representing complex objects...
1. Opening a File for Reading Use fopen() with read mode:
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FILE *fopen(const char *filename, const char *mode); |
Mode Description “r” Read (file must exist) “r+” Read & write (file must exist) “a+” Read & append (creates file if...
1. Opening a File for Writing Use fopen() with a write mode: FILE *fopen(const char *filename, const char *mode); Mode Description “w” Write (creates a new file or overwrites existing file) “a” Append (adds...
1. What is File Handling in C? File handling allows a program to store data permanently in a file on disk. Types of files in C: Text files → store readable characters (.txt) Binary...
1. What is a Callback Function? A callback function is a function passed as an argument to another function. The receiving function can call the passed function at a specific point. Enables dynamic behavior...
1. What is a Function Pointer? A function pointer is a pointer that points to the address of a function instead of a variable. It allows you to call a function indirectly and is...
1. What is Recursion? Recursion occurs when a function calls itself directly or indirectly. Useful for problems that can be broken down into smaller, similar sub-problems. Every recursive function must have a base case...
1. What is an Inline Function? An inline function suggests to the compiler to replace the function call with the function code itself. This can reduce function call overhead and increase performance for small...
