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← C Programming for Beginners

○What a program actually does ○The computer and the operating system ○From a C file to a running program ○Compiled and interpreted programs ○Demo: Trace One Tiny C Program ○Exercise: Print the Opening Sign ✦Module Quiz

○Your First C Program ○Variables and Formatted Output ○Arithmetic and Integer Division ○Demo: Formatting and Numeric Conversion ○Exercise: Calculate a Shop Total ✦Module Quiz

○Demo: Declare and initialize variables ○Exercise: Declare and initialize variables ○Demo: Assign a new value ○Exercise: Assign a new value ○Demo: Choose int, double, and char ○Exercise: Choose int, double, and char ○Demo: Keep local names and constants clear ○Exercise: Keep local names and constants clear ✦Module Quiz

○Demo: Match printf placeholders and arguments ○Exercise: Match printf placeholders and arguments ○Demo: Build lines with escapes and multiple calls ○Exercise: Build lines with escapes and multiple calls ○Demo: Print percent signs and aligned values ○Exercise: Print percent signs and aligned values ○Demo: Evaluate expressions before printing ○Exercise: Evaluate expressions before printing ✦Module Quiz

○Comparisons and True or False ○How if and else Choose a Path ○Exercise: Choose a Ticket Message ○Demo: Select a Fixed Choice with switch ○Exercise: Choose a Service Desk ✦Module Quiz

○For Loops: Repeat a Known Number of Times ○Exercise: Add Daily Contributions ○While Loops: Repeat While a Condition Holds ○Exercise: Make a Countdown ○Demo: Run Once with do while ○Demo: Label a Two-Row Shelf ○Exercise: Label Tool Drawers ✦Module Quiz

○Define and Call a Function ○Follow a Function Call and Its Return Value ○Exercise: Return a Square ○Demo: Declare Before a Function Call ○Exercise: Declare and Convert ✦Module Quiz

○Arrays and Zero-Based Indexes ○Exercise: Add Array Elements ○Demo: Count Array Slots Safely ○Exercise: Average Workshop Ratings ○Demo: Rows and Columns in Memory ○Exercise: Total a Two-Row Grid ✦Module Quiz

○C Strings and the Null Terminator ●Exercise: Count a Label ○Demo: Compare Complete Strings ○Exercise: Verify a Pickup Code ○Demo: Visit Each Character ○Exercise: Count a Letter in a Label ✦Module Quiz

○Pointers: Addresses and Dereferencing ○Exercise: Update Through a Pointer ○Demo: Pass an Address to a Function ○Exercise: Swap Two Counts ○Demo: Array Addresses and Offsets ○Exercise: Total with an In-Bounds Pointer ○Demo: Null, Validity, and Lifetime ○Exercise: Handle an Optional Pointer ✦Module Quiz

○Demo: Pass an Array and Its Length ○Exercise: Total Readings in a Function ○Demo: Change Array Elements Through a Parameter ○Exercise: Update Each Stock Count ✦Module Quiz

○Define a Supply Record ○Exercise: Define a Supply Record ○Update a Record Member ○Exercise: Update a Record Member ○Walk an Array of Records ○Exercise: Walk an Array of Records ○Pass a Record to a Function ○Exercise: Pass a Record to a Function ✦Module Quiz

○Demo: One Value in Shared Storage ○Exercise: Record One Ticket Value ○Demo: A Tag Tells You What Is Stored ○Exercise: Read a Tagged Repair Ticket ○Demo: Compare Union and Struct Storage ○Exercise: Choose the Right Storage ✦Module Quiz

○Demo: Read Bits with AND ○Exercise: Check an Equipment Flag ○Demo: Turn a Flag On with OR ○Exercise: Mark a Kit Ready ○Demo: Toggle and Clear Individual Flags ○Exercise: Toggle a Warning Flag ○Demo: Move a Bit into Position ○Exercise: Build a Position Mask ✦Module Quiz

○Include the Right Header ○Exercise: Include the Right Header ○Guard a Macro Default ○Exercise: Guard a Macro Default ○Demo: Include Code Only for Debug Builds ○Exercise: Gate an Inventory Diagnostic ○Demo: Parenthesize a Simple Macro ○Exercise: Keep a Macro Calculation Grouped ✦Module Quiz

○Name a Status with enum ○Exercise: Name a Status with enum ○Alias a Record Type with typedef ○Exercise: Alias a Record Type with typedef ✦Module Quiz

○Where the storage comes from ○Demo: Request and Release an Array ○Exercise: Store Three Repair Counts ○Demo: Start Allocated Counters at Zero ○Exercise: Start Station Counters at Zero ○Allocate and Release Records ○Exercise: Allocate and Release Records ✦Module Quiz

○Print a Formatted Label ○Exercise: Print a Formatted Label ○Print Characters with putchar ○Exercise: Print Characters with putchar ○Format into a Bounded Buffer ○Exercise: Format into a Bounded Buffer ○Write a Line to stdout with fputs ○Exercise: Write a Line to stdout with fputs ○Input and Diagnostics in a Local Terminal ✦Module Quiz

Exercise: Count a Label

A trail marker needs its label length printed. strlen counts characters up to, but not including, the \0 terminator. It returns size_t, so use %zu in printf to display the result.

Your Task

Include <string.h>, declare a modifiable character array initialized with "Trail", and print Letters: 5 followed by a newline using strlen(label) and %zu.

Hint 1

1 / 1

HINT 1

Use char label[] = "Trail"; then printf with %zu and strlen(label).

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Press Run to execute your code.

READY

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