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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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Square Pattern or NxN Pattern in C

Pattern Name= Square Pattern or NxN  Pattern,

Pattern N0=1

*********************************************** 

 * * * * *

 * * * * *

 * * * * *

 * * * * *

 * * * * *

#include<stdio.h>

int main()

{

        int num;

        printf("Enter the number:\n");

        scanf("%d",&num);

        for(int i=1;i<=num;i++)

 {

  for(int j=1;j<=num;j++)

 {

 printf(" *");

  }

 printf("\n");

}

}

 ************************************************

************************************************

 1 1 1 1 1

 2 2 2 2 2

 3 3 3 3 3

 4 4 4 4 4

 5 5 5 5 5

#include<stdio.h>

int main()

{

        int num;

        printf("Enter the number:\n");

        scanf("%d",&num);

        for(int i=1;i<=num;i++)

        {

                for(int j=1;j<=num;j++)

                {

  printf(" %d",i);

}

                printf("\n");

        }

}
***********************************************

 1 2 3 4 5

 1 2 3 4 5

 1 2 3 4 5

 1 2 3 4 5

 1 2 3 4 5

#include<stdio.h>

int main()

{

        int num;

        printf("Enter the number:\n");

        scanf("%d",&num);

        for(int i=1;i<=num;i++)

        {

                for(int j=1;j<=num;j++)

                {

                        printf(" %d",j);

                }

                printf("\n");

        }

}

***********************************************

 5 4 3 2 1

 5 4 3 2 1

 5 4 3 2 1

 5 4 3 2 1

 5 4 3 2 1

#include<stdio.h>

int main()

{

        int num;

        printf("Enter the number:\n");

        scanf("%d",&num);

        for(int i=num;i>=1;i--)

        {

                for(int j=num;j>=1;j--)

                {

                        printf(" %d",j);

                }

                printf("\n");

        }

}

***********************************************


 5 5 5 5 5

 4 4 4 4 4

 3 3 3 3 3

 2 2 2 2 2

 1 1 1 1 1

#include<stdio.h>

int main()

{

        int num;

        printf("Enter the number:\n");

        scanf("%d",&num);

        for(int i=num;i>=1;i--)

        {                for(int j=num;j>=1;j--)

                {

                        printf(" %d",i);

                }

                printf("\n");

        }

}

***********************************************

 A A A A A

 B B B B B

 C C C C C

 D D D D D

 E E E E E

#include<stdio.h>

int main()

{

        int num;

        printf("Enter the number:\n");

        scanf("%d",&num);

        for(int i=1;i<=num;i++)

        {

                for(int j=1;j<=num;j++)

                {

                        printf(" %c",i+64);

                }

                printf("\n");

        }

}

***********************************************

 A B C D E

 A B C D E

 A B C D E

 A B C D E

 A B C D E

#include<stdio.h>

int main()

{

        int num;

        printf("Enter the number:\n");

        scanf("%d",&num);

        for(int i=1;i<=num;i++)

        {

                for(int j=1;j<=num;j++)

                {

                        printf(" %c",j+64);

                }

                printf("\n");

        }

}
***********************************************

 E E E E E

 D D D D D

 C C C C C

 B B B B B

 A A A A A

#include<stdio.h>

int main()

{

        int num;

        printf("Enter the number:\n");

        scanf("%d",&num);

        for(int i=num;i>=1;i--)

        {

                for(int j=num;j>=1;j--)

                {

                        printf(" %c",i+64);

                }

                printf("\n");

        }

}

***********************************************

 E D C B A
 E D C B A
 E D C B A
 E D C B A
 E D C B A

#include<stdio.h>
int main()
{
        int num;
        printf("Enter the number:\n");
        scanf("%d",&num);
        for(int i=num;i>=1;i--)
        {
                for(int j=num;j>=1;j--)
                {

                        printf(" %c",j+64);


                }
                printf("\n");

        }

}
***********************************************


 

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