Advanced C Programming

Learn to print an integer in reverse by repeatedly dividing by 10 and taking the remainder, then convert digits to ASCII and output with putchar.

Count vowels in a sentence via a lookup-table method and a char-by-char scan. Master input handling with getchar, tolower, and switch-case, and compare O(n) versus O(n^2) solutions.

Write a dynamic int array in C by implementing createDynamicArray, allocating with malloc, initializing elements to a value, checking for allocation failure, and returning the pointer to the first element.

implement a delay function in C with time.h, clock_t start, and a while loop to track elapsed time, convert with CLOCKS_PER_SEC, and print hello after the specified delay.

Solve a sample perfect numbers problem in C by writing a function that sums divisors excluding itself up to half the number to verify perfection.

Explore writing function-like macros in C, including an array size macro and a leap year macro that enforces four-year rules with 100 and 400 year exceptions.

Develop and implement isAtBegin and isAtEnd to check a substring at the start or end of a string, using strlen, strcmp, and pointer arithmetic, with Batman examples and 0/1 returns.

Demonstrate checking divisibility by 9 for a 500-digit number by summing digits read with getchar until a newline. Show using long long, ASCII digit handling, sum accumulation, and printing result.

Count how many times each digit 0–9 appears in a user input number by using a 10-element array, updating counts with mod 10 and division by 10, then print results.

Demonstrates how to find the most frequently repeated element in an array and its count, using a header file and a utility module with pointers.

Write a function that finds the second largest element in an array. Use a max and a second variable, and pass the array by pointer with its size.

Learn to write a function that returns the address of the second largest element in an array using pointers and indirection in C.

Learn to store three waiters' tips for five days in a 3x5 multidimensional array, fill it with random values up to 100, and print the matrix using two functions.

This lesson extends multidimensional arrays to compute each waiter's weekly tips. It demonstrates returning an array via a pointer, dynamic memory allocation with malloc, and freeing memory.

Identify the weekly highest tip from a multidimensional array, revealing the day and waiter, using a return value and call-by-reference with a days lookup table.

Clarify gym software needs, document requirements, and agree on features. Show how to round login times to the nearest class slot and display both am-pm and 24-hour formats.

Convert the user time input to minutes and compare it against eight intervals stored in a struct array. Then print the matching interval using the print function.

Explore passing a time structure by value or call-by-reference, prototype versus definition naming, and formatting start and end times from minutes to hours with am/pm using sprintf and printf.

Fix time input logic in the gym software, convert minutes to hours, and correctly format end times in a 12-hour clock. Address decimal input, pm display, and Qt framework integration.

Convert an integer to binary form without using Itoa, employing bitwise operations, masks, and left shifts to print bits with optional eight-bit grouping.

Develop a function-like macro to convert red, green, and blue values into a hex color by using 8-bit shifts and bitwise OR, and print the hex representation.

Explore file operations in advanced C programming by counting characters, words, lines, and letter frequencies in a text file, using fgetc and EOF to read until end of file.

Merge two incoming bytes into a single variable using a left shift and bitwise or with uint16_t. Explore endianness options, and practical search keywords like Stack Overflow for byte concatenation.

Store a four-byte value in an unsigned char array, extract bytes with a 0xff mask and right shifts, and send them byte by byte via a protocol.

Write a C program to count words in a text file by reading characters and counting each space as a word delimiter, via a dedicated function returning int.

Count lines in a C program by detecting newline characters and end-of-file, increment a line counter, and rename the function to line_counter.

Explore a level three file operations problem that counts letter occurrences from a test file using a 26-element array, handles case insensitivity, and writes results to a destination file.

Explore memory access errors that cause segfaults and strtalk val, such as accessing memory you don't own, null or freed pointers, and returning addresses of locals; learn to use const.

Master debugging techniques in advanced C programming using breakpoints, debug mode, and stepping over and into functions, inspecting variables, memory, array data, and pointer arithmetic to identify and fix errors.

Enable conditional debugging by setting conditions on breakpoints to stop when i reaches a target value, allowing quick inspection of i and x without full loop stepping.

Explore breakpoints and hit counts in debugging C programs, stepping through code, observing pointer values, and using actions to print values at specified hit counts or multiples.

Learn how to use the watch window to track variables while debugging, contrast local, auto, and locals scopes, and monitor values like i, j, sum, and x in real time.

Explore how the call stack tracks active function calls, the current execution location, and where control returns, illustrated by stepping through main, foo, and swap and by inspecting locals.