Loops in C - for, while, and do-while
Loops in C - for, while, and do-while
Introduction
Loops are essential in C programming for repeating a block of code multiple times. They allow you to automate tasks and perform operations with varying data. In this tutorial, we will explore three primary types of loops in C: for, while, and do-while. We'll cover their usage with sample code to illustrate their functionality.
for Loop
The for loop allows you to repeatedly execute a block of code for a specific number of times:
#include <stdio.h>
int main() {
int i;
for (i = 1; i <= 5; i++) {
printf(`Iteration %d\n`, i);
}
return 0;
}
In this example, the for loop runs five iterations and prints `Iteration 1` to `Iteration 5.`
while Loop
The while loop allows you to repeatedly execute a block of code as long as a condition is true:
#include <stdio.h>
int main() {
int count = 0;
while (count < 5) {
printf(`Count: %d\n`, count);
count++;
}
return 0;
}
In this example, the while loop runs until count becomes greater than or equal to 5. It prints `Count: 0` to `Count: 4.`
do-while Loop
The do-while loop is similar to the while loop but guarantees at least one execution of the code block:
#include <stdio.h>
int main() {
int number = 0;
do {
printf(`Number: %d\n`, number);
number++;
} while (number < 5);
return 0;
}
In this example, the do-while loop runs at least once, and then it continues executing as long as number is less than 5. It prints `Number: 0` to `Number: 4.`
Conclusion
Loops are powerful tools in C programming for repetitive tasks and automation. You've learned how to use for, while, and do-while loops with sample code. Understanding and mastering loops is crucial for building efficient and dynamic programs in C.