C Program to Detection of a Prime Number

How to write a C Program to Detection of a Prime Number in C Programming Language ?

Write a program to determine whether a number is prime or not. 

Note :A prime number is one, which is divisible only by 1 or itself. 

1. #include<stdio.h>
2. main()
3. {
4. int num, i;
5.  
6. printf ("Enter a number:");
7. scanf ("%d", &num);
8.  
9. i=2;
10. while (i<=num - 1)
11.  
12. {
13. if (num % i ==0)
14.  
15. {
16. printf ("Not a prime number");
17. break;
18. }
19.  
20. i++;
21. }
22.  
23. if (i == num)
24.  
25. printf ("Prime Number");
26. }

C Program to Check Given String is Palindrome or Not

How to write a C Program to Check Given String is Palindrome or Not in C Programming Language ?

Solution:

1. #include <stdio.h>
2. #include <conio.h>
3. #include <string.h>
4. void main()
5. {
6.  char a[10],b[10];
7.  clrscr();
8.  printf("\nEnter a string: ");
9.  gets(a);
10.  strcpy(b,a);
11.  strrev(b);
12.  if(strcmp(a,b)==0)
13.  {
14.   printf("%s is palindrom",a);
15.  }
16.  else
17.  {
18.   printf("%s is not palindrom",a);
19.  }
20.  getch();
21. }

C Program To Find Prime Number And If Number Is Not Prime Then Find Factors

Write a C program to find prime number and if number is not prime then find factors of the number in C Programming Language ?

Solution:

1. #include <stdio.h>
2. #include <conio.h>
3. void main()
4. //C Program to Check whether the Given Number is a Prime
5. //C program to display all the factors of a number entered by user.
6. {
7.  int flag=0,i,n,r,a[100],b=0,s;
8.  clrscr();
9.  printf("\n Enter Number: ");
10.  scanf("%d",&n);
11.  for(i=2;i<=n/2;i++)
12.  {
13.   r=n%i;
14.   if(r==0)
15.   {
16.    flag=s;
17.    a[b]=i;
18.    b++;
19.   }
20.  }
21.  if(flag==s)
22.  {
23.   printf(" So The Number %d is not prime",n);
24.   printf("\n The factors are: ");
25.   for(i=0;i<b;i++)
26.   {
27.    printf("%d ",a[i]);
28.   }
29.  }
30.  else
31.  {
32.   printf("\n So The Number %d is prime",n);
33.  }
34.  getch();
35. }

C Program to Check Whether Number Is Perfect Or Not

How to Write A C Program Whether a Number Is Perfect Or Not ?

Solution:

1. #include<stdio.h>
2. int main()
3. {
4.     int number,sum=0,i;
5.     scanf("%d", &number);
6.  
7.     for(i=1; i<=number/2; i++) {
8.         if(number%i==0) {
9.             sum = sum + i;
10.         }
11.     }
12.     if(sum==number) {
13.         printf("Perfect Number");
14.     }
15.     else {
16.         printf("Not");
17.     }
18. }

C Program To Read A Parenthesised Infix Expression From The User And Check Whether It Is Well Parenthesised Or Not

How to write a c program to read a parenthesised infix expression from the user and check whether it is well parenthesised or not in C Programming Language ?

Solution:
/*write a c program to read a parenthesised infix expression from the user and check whether it is well parenthesised or not */

Input a Number and Check if it's Palindrome or not C Program

How to write a C Program to input a number and check if it's palindrome or not in C Programming Language ?

//Program to input a number and check if it's palindrome or not.
#include<stdio.h>
#include<conio.h>

void main()
{
int number,

clrscr();

printf("Enter number: ");
scanf("%d", &number);

while(number != 0) {
number % 10);
number = number / 10;
}

getch();
}

check if the number is a palindrome number or not.