C PROGRAMS : CONTROL STRUCTURES

11.Program to find whether a given number is Prime or Not

#include<stdio.h>
#include<conio.h> // Linux user - Remove this

int main()
{
 /* Declaring variable for n=number, c=counter variable:holds 
 number of factor of 'n' */
 int n,c=0, i;
 
 // Inputting number
 printf("Enter number to check whether Prime or Not:");
 scanf("%d",&n);

 // Checking whether number valid or not
 if(n>0)
 {
  
 // Checking whether number is prime or not 
 for(i=1;i<=n;i++)
 {
  if(n%i==0)
  c=c+1;
 }
 
 if(c==2)
 printf("Prime Number");
 else
 printf("Not a Prime Number");
 }
 
 else 
 printf("Not a valid Number");

 getch(); // Linux user - Remove this

 return 0;
}

12.Program to print ( list ) all the prime number between 1 to n

#include<stdio.h>
#include<conio.h> // Linux user - Remove this

int main()
{
 /* Declaring variable for n=number, c=counter variable:holds 
 number of factor of 'n' */
 int n,c, i,j;
 
 // Inputting number
 printf("Enter number till which you want to list prime number:");
 scanf("%d",&n);

 // Checking whether number valid or not
 
 if(n>0)
 {
  printf("List of Prime Numbers:");
 // Checking whether number is prime or not 
 for(i=1;i<=n;i++)
 {
  c=0;
  for(j=1;j<=i;j++)
  {
  if(i%j==0)
  c=c+1;
  }
 if(c==2)
 printf("%d ",i);
 }
 
 }
 else 
 printf("Not a valid Number");
 getch(); // Linux user - Remove this

 return 0;
}

13.Program to print (list) Palindrome number from 10 to n

// Palindrome Number: Reverse of Number = Number

#include<stdio.h>
#include<conio.h> // Linux user - Remove this

int main()
{
/*declaring variable for num=user wish, i=acts as number, n=to copy number, 
d=digit, rev=reverse of number */
int num,n,d=0,rev,i;

// Inputting number
printf("Enter number till which you want to list Palindrome Number:");
scanf("%d",&num);

printf("List of Palindrome Number:");
for(i=10;i<=num;i++)
{
 // copying number in n
 n=i;
 rev=0;
// Determining whether number is palindrome or not
while(n!=0)
{
           d=n%10;
           rev=rev*10+d;
           n=n/10;
           }
           
           // Displaying Whether number is palindrome or not
           if(i==rev)
           printf("%d ",i);
       }
      
     getch(); // Linux user - Remove this

     return 0;
     
     }

14.Program to print (list) Armstrong Number between two given numbers

// Armstrong Number: Sum of cube of digit=Number

#include<stdio.h>
#include<conio.h> // Linux user - Remove this

int main()
{
/*declaring variable for s=start point, e=end point, i=acts as number, 
n=to copy number, d=digit, s=sum */
int s,e,n,d=0,sum,i;

// Inputting number
printf("Enter form where you want to list Armstrong Number:");
scanf("%d",&s);
printf("Enter number till which you want to list Armstrong Number:");
scanf("%d",&e);

printf("List of Armstrong Number:");
for(i=s;i<=e;i++)
{
 // copying number in n
 n=i;
 sum=0;
 
// Determining whether number is pallindrome or not
while(n!=0)
{
           d=n%10;
           sum=sum+(d*d*d);
           n=n/10;
 }
           
           // Displaying Whether number is pallindrome or not
           if(i==sum)
           printf("%d ",i);
 }
      
     getch(); // Linux user - Remove this

     return 0;
     
}

15.Program to print the factor of a given number

#include<stdio.h>
#include<conio.h> // Linux user - Remove this

int main()
{
 // Declaring variable for n=numbre,i=to iterate the loop
 int n,i;
 
 // Inputing number
 printf("Enter any number:");
 scanf("%d",&n);
 
 // Determining and Displaying factors
 printf("Listing Factors of %d :",n);
 for(i=1;i<=n;i++)
 {
  if(n%i==0)
  printf("%d ",i);
 }
 
 getch(); // Linux user - Remove this

 return 0;
}

Author : Mantu Kumar

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