C Online Compiler
Example: Check Prime Number in C
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main.c
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// Check Prime Number #include <stdio.h> #include <math.h> // Required for sqrt() // Function to check if a number is prime int isPrime(int num) { // Step 1: Handle base cases for numbers less than or equal to 1 if (num <= 1) { return 0; // Not prime } // Step 2: Loop from 2 up to the square root of the number // If any number divides 'num' evenly, it's not prime for (int i = 2; i <= sqrt(num); i++) { if (num % i == 0) { return 0; // Not prime } } // Step 3: If no divisors found, the number is prime return 1; // Prime } int main() { int number = 7; // Example number if (isPrime(number)) { printf("%d is a Prime number.\n", number); } else { printf("%d is not a Prime number.\n", number); } number = 10; // Another example if (isPrime(number)) { printf("%d is a Prime number.\n", number); } else { printf("%d is not a Prime number.\n", number); } return 0; }
Output
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