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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...

WAP to find the greatest of given 3 numbers

Description :  

You should read 3 integers from user and find the maximum of three numbers.

Sample Execution : 

Test case 1 : 

Enter the three numbers : 10 20 30

Max of three number is 30 

Test case 2 :

Enter the three numbers : 90 20 40

Max of three number is 90 

PROGRAM:

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#include<stdio.h>

int main()

{

int num1,num2,num3;

    printf("Enter the three numbers:");

    scanf("%d %d %d",&num1,&num2,&num3);

    if(num1>=num2 && num1>num3)

    {

    printf("Max of three number is %d",num1);

    }

    else if (num2>=num1 && num2>=num3)

    {

        printf("Max of three number is %d",num2);

    }

    else if(num3>=num1 && num3>=num2) 

    printf("Max of three number is %d",num3);

}

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sample input;

Enter three numbers:10 20 30

sample output:

Max of three numberis 30

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