C Programming
Master the fundamentals of C programming with comprehensive tutorials, examples, and hands-on exercises
do...while Loop in C
The do...while loop is similar to the while loop, but it guarantees that the code block executes at least once, even if the condition is initially false.
do...while Loop Syntax
do {
// code to be executed
} while (condition);
Basic do...while Loop
#include <stdio.h>
int main() {
int i = 1;
printf("Numbers from 1 to 5:\n");
do {
printf("%d ", i);
i++;
} while (i <= 5);
printf("\n");
return 0;
}Menu-Driven Program Example
Simple Menu System
#include <stdio.h>
int main() {
int choice;
do {
printf("\n=== MENU ===\n");
printf("1. Say Hello\n");
printf("2. Calculate Square\n");
printf("3. Exit\n");
printf("Enter your choice: ");
scanf("%d", &choice);
switch (choice) {
case 1:
printf("Hello, World!\n");
break;
case 2: {
int num;
printf("Enter a number: ");
scanf("%d", &num);
printf("Square of %d is %d\n", num, num * num);
break;
}
case 3:
printf("Goodbye!\n");
break;
default:
printf("Invalid choice! Please try again.\n");
}
} while (choice != 3);
return 0;
}while vs do...while
while Loop
- Condition checked before execution
- May not execute at all
- Entry-controlled loop
do...while Loop
- Condition checked after execution
- Executes at least once
- Exit-controlled loop
Frequently Asked Questions
C is a powerful, general-purpose programming language that's been around since the 1970s. It's the foundation for many modern languages and is essential for system programming, embedded systems, and understanding how computers work at a low level. Learning C gives you a solid foundation in programming fundamentals.
No prior programming experience is required! Our C programming tutorial is designed for complete beginners. We start with the basics and gradually progress to more advanced topics. However, having some basic computer literacy and logical thinking skills will be helpful.
You need a C compiler to run C programs. For beginners, we recommend using our online C compiler which requires no installation. For local development, you can use GCC (GNU Compiler Collection) which is available on Windows (via MinGW), macOS (via Xcode), and Linux. IDEs like Code::Blocks, Dev-C++, or Visual Studio Code are also helpful.
The time to learn C depends on your dedication and prior experience. With consistent practice (1-2 hours daily), you can grasp the basics in 2-4 weeks and become proficient in 2-3 months. Mastering advanced concepts like pointers, memory management, and data structures may take 6-12 months of regular practice.
C programming skills open doors to various career paths including system programming, embedded systems development, operating system development, device driver programming, game development, and firmware development. Many companies in automotive, aerospace, telecommunications, and IoT sectors actively seek C programmers.
Absolutely! C remains highly relevant and is consistently ranked among the top programming languages. It's essential for system programming, embedded systems, IoT devices, and performance-critical applications. Many modern languages are built on C, and understanding C helps you become a better programmer overall.