Introduction:
In this program, we will create a simple countdown timer that counts down from a user-specified number of seconds. The program will display the current time remaining on the screen every second. This is a basic example that introduces concepts like loops, time delay functions, and user input handling in C programming.
Objective:
The goal is to implement a countdown timer that begins from a specified number of seconds, decrementing every second, and finally prints a message when the countdown reaches zero.
Code:
#include #include #include // for sleep() function int main() { int seconds; // Ask the user for the number of seconds to countdown from printf("Enter the number of seconds to countdown from: "); scanf("%d", &seconds); // Validate if the number of seconds is positive if (seconds <= 0) { printf("Please enter a valid positive number.\n"); return 1; } // Countdown loop while (seconds > 0) { printf("%d seconds remaining...\n", seconds); sleep(1); // Wait for 1 second seconds--; // Decrease the countdown } // Countdown finished printf("Time's up!\n"); return 0; }
Explanation of the Program Structure:
The program begins by prompting the user to input a number of seconds to start the countdown. It then enters a while loop, where it repeatedly prints the remaining time every second using the sleep(1)
function to create a delay of one second between each iteration. The loop continues until the countdown reaches zero, at which point a “Time’s up!” message is displayed.
How to Run the Program:
- Open a text editor and paste the C code provided above.
- Save the file with a .c extension (e.g.,
countdown_timer.c
). - Open a terminal or command prompt on your computer.
- Navigate to the directory where the C file is saved.
- Compile the program using a C compiler. For example, using
gcc countdown_timer.c -o countdown_timer
on a Linux or macOS terminal. - Run the compiled program by typing
./countdown_timer
in the terminal (for Linux/macOS) orcountdown_timer.exe
(for Windows). - Input the number of seconds when prompted, and the countdown will begin.
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