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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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Write a program to check whether character is Upper Case, Lower Case or Digit

 Description : 

You have to read a characer and check it is  upper case, lower case, digit or none.of.above.

Sample Execution : 

Test case 1 : 

Enter the character : A

The character is Upper Case.

Test case 2 :

Enter the character : 5

The character is Digit.

Test case 3 :

Enter the character : !

The character not an alphabet or digit.

PROGRAM:

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#include<stdio.h>

int main()

{

    char ch;

  printf("Enter a character or digit;");

    scanf("%c",&ch);

     if(ch>='A' && ch<='Z')

   { printf("%c The character is Upper Case",ch );}

    else if(ch>='a' && ch<='z')

  {

       printf("%c The character is Lower Case",ch);

   }

   else if (ch>='0' && ch<='9')

   {

       printf("The character is Digit.");

   }

   else

   {

       printf("The character  not an  alphabet or digit.");

   }

   }

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sampleoutput;Enter a character:A

sampleinput;The character is Upper case.



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