Count in C: Learn the Basics of Counting Digits and Loops

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Want to learn how to count in C? Counting is an essential part of programming, whether it’s counting digits, iterations, or elements in an array. If you're new to C programming, understanding counting techniques can improve your logical thinking and coding efficiency.

One of the simplest counting programs in C involves determining the number of digits in a given number. Here's an example:

c
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#include

int main() {
int num, count = 0;

printf("Enter a number: ");
scanf("%d", &num);

do {
count++;
num /= 10;
} while (num != 0);

printf("Count of digits: %d\n", count);
return 0;
}
In this program, a do-while loop ensures that at least one iteration occurs, making it efficient for handling the number 0.

Counting is also widely used in arrays. Here’s a basic example of counting even numbers in an array:

c
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#include

int main() {
int arr[] = {2, 5, 7, 8, 10, 3};
int count = 0, size = sizeof(arr) / sizeof(arr[0]);

for (int i = 0; i < size; i++) {
if (arr[i] % 2 == 0)
count++;
}

printf("Count of even numbers: %d\n", count);
return 0;
}
This program iterates through an array and counts how many even numbers exist.