C Programming Complete Syntax & Pointer Quick Reference Sheet
Compact exam revision cheat sheet summarizing format specifiers, pointer syntax, memory allocation, and file operations in C.
C Programming · CACS101 · Semester 1
Unit 3•Unit 3 of 4
Unit 3: 2. Dynamic Memory Allocation Functions (`<stdlib.h>`)
``c int *p = (int*) malloc(n * sizeof(int)); // Uninitialized memory int *q = (int*) calloc(n, sizeof(int)); // Zero-initialized memory p = (int*) realloc(p, new_size * sizeof(int)); // Resize existing block free(p); // Release heap memory back to OS p = NULL; // Avoid dangling pointer! ``
CS50x Introduction to C Programming Lecture (David J. Malan)
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Related notes
- C Programming — Complete Course Notes (BCA 1st Sem)Notes
- Unit 1: Introduction to Programming Concepts and C Language NotesNotes
- Unit 2: Operators and Expressions NotesNotes
- Unit 3: Input and Output Operations NotesNotes
- Unit 4: Control Statements and Decision Making NotesNotes
- Unit 5: Arrays and String Manipulations NotesNotes
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- What is the return type of the `malloc()` function in C? (a) `int*` (b) `char*` (c) `void*` (d) `float*`objective · 1 marks
- Explain the difference between call by value and call by reference in C with suitable code snippets.short · 5 marks
- What is recursion? Write a recursive function in C to calculate the factorial of a positive integer.short · 5 marks
- Explain dynamic memory allocation in C. Differentiate between `malloc()` and `calloc()`. Write a C program to dynamically allocate memory for N integers, sort them in ascending order, and free the memory.long · 10 marks