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C Program to Check Prime Number Using Efficient Logic

  Introduction A prime number is a number that has exactly two distinct positive divisors: 1 and itself. In this program, we check whether a given number is prime or not using a simple and efficient logic. This type of program is commonly used in mathematics, competitive programming, and basic algorithm learning for beginners in C programming. Problem Statement The task is to write a C program that determines whether a given integer is a prime number or not. The program takes a single integer input from the user and analyzes its divisibility. If the number has no divisors other than 1 and itself, it should be identified as a prime number; otherwise, it is not prime. This problem is important in number theory and has practical relevance in areas such as cryptography, data validation, and algorithm design.  Algorithm / Logic Explanation To check whether a number is prime, we need to verify that it is not divisible by any number other than 1 and itself. The algorithm follows a si...
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Find Greatest of Three Numbers in C

Find Greatest of Three Numbers in C

✅ Find the Greatest of Three Numbers in C

#include <stdio.h>

int main() {
    int a, b, c;

    // Input
    printf("Enter three numbers:\n");
    scanf("%d %d %d", &a, &b, &c);

    // Logic to find greatest
    if (a >= b && a >= c) {
        printf("The greatest number is: %d\n", a);
    } else if (b >= a && b >= c) {
        printf("The greatest number is: %d\n", b);
    } else {
        printf("The greatest number is: %d\n", c);
    }

    return 0;
}

📘 Explanation:

This C program takes three integers as input and determines the greatest among them using simple conditional statements. It compares the three numbers using nested if-else blocks:

  • First checks if a is greater than or equal to both b and c.
  • If not, then checks if b is greater than or equal to the other two.
  • If both conditions fail, then c is the greatest by default.
This approach ensures correct output even if the numbers are equal.

🧾 Sample Output:

Enter three numbers:
12 45 33
The greatest number is: 45

🔑 Keywords:

Greatest of three numbers, if else in C, compare numbers in C, logic building in C, beginner level C program, C programming basics

📌 Hashtags:

#CProgramming #BeginnerC #MaxOfThree #ComparisonLogic #IfElseC #CodingBasics

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