Star Pattern Program in C

/*Star Pattern Program in C

Author - Chinmay Mahajan*/

#include<stdio.h>
#include<conio.h>

void main()
{
int i,j,k,m,o,f,n;
clrscr();
printf("Enter value of n \n");
scanf("%d",&n);
k=n;
o=1;
for(i=0;i<n;i++) //for number of lines
{

for(j=0;j<k;j++) //for left spacing
{
printf("_");
}
for(m=0;m<o;m++) //for Printing *
{
printf(" *");
}

for(f=0;f<k;f++)  //for right spacing
{
printf("_");
}
printf("\n"); //new line
k--;
o++;
}//outer for
}//main

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Star Pattern in C language

#include<stdio.h>
#include<conio.h>
void main()
{
int b=2,c=1,i,p,a;
clrscr();
for(i=0;i<3;i++)
{
for(a=0;a<b;a++)
{
printf(" ");
}//for spacing
for(p=0;p<c;p++)
{
printf(" *");
}//for printing
for(a=0;a<b;a++)
{
printf(" ");
}//for spacing
for(p=0;p<c;p++)
{
printf(" *");
}//for printing
for(a=0;a<b;a++)
{
printf(" ");
}//for spacing
printf("\n");
b--;
c++;

}//outer for loop
getch();
}//eofm

c program to reverse a number

#include <stdio.h>
 
main()
{
   int n, reverse = 0;
 
   printf("Enter a number to reverse\n");
   scanf("%d",&n);
 
   while (n != 0)
   {
      reverse = reverse * 10;
      reverse = reverse + n%10;
      n = n/10;
   }
 
   printf("Reverse of entered number is = %d\n", reverse);
 
   return 0;
}

Decimal to binary conversion

#include <stdio.h>
 
int main()
{
  int n, c, k;
 
  printf("Enter an integer in decimal number system\n");
  scanf("%d", &n);
 
  printf("%d in binary number system is:\n", n);
 
  for (c = 31; c >= 0; c--)
  {
    k = n >> c;
 
    if (k & 1)
      printf("1");
    else
      printf("0");
  }
 
  printf("\n");
 
  return 0;
}

Palindrome number program c

Palindrome number algorithm

1. Get the number from user.
2. Reverse it.
3. Compare it with the number entered by the user.
4. If both are same then print palindrome number
5. Else print not a palindrome number.

 -----------------------------------------------------------

#include<stdio.h>
 
main()
{
   int n, reverse = 0, temp;
 
   printf("Enter a number to check if it is a palindrome or not\n");
   scanf("%d",&n);
 
   temp = n;
 
   while( temp != 0 )
   {
      reverse = reverse * 10;
      reverse = reverse + temp%10;
      temp = temp/10;
   }
 
   if ( n == reverse )
      printf("%d is a palindrome number.\n", n);
   else
      printf("%d is not a palindrome number.\n", n);
 
   return 0;
}

c program to print pattern stars

#include<stdio.h>
 
main()
{
   int row, c, n, temp;
 
   printf("Enter the number of rows in pyramid of stars you wish to see ");
   scanf("%d",&n);
 
   temp = n;
 
   for ( row = 1 ; row <= n ; row++ )
   {
      for ( c = 1 ; c < temp ; c++ )
         printf(" ");
 
      temp--;
 
      for ( c = 1 ; c <= 2*row - 1 ; c++ )
         printf("*");
 
      printf("\n");
   }
 
   return 0;

Code for Armstrong number in c

#include<stdio.h>

int main(){

    int num,r,sum=0,temp;

    printf("Enter a number: ");

    scanf("%d",&num);

    temp=num;

    while(num!=0)

    {

         r=num%10;

         num=num/10;

         sum=sum+(r*r*r);

    }

    if(sum==temp)

         printf("%d is an Armstrong number",temp);

    else

         printf("%d is not an Armstrong number",temp);

    return 0;

}

---------------------------------------------------------------------------------------

Sample output:

Enter a number: 153

153 is an Armstrong number

Pascal triangle in c

   1
  1 1
 1 2 1
1 3 3 1 

---------------------------------------------------------------------

#include<stdio.h>
 
long factorial(int);
 
main()
{
   int i, n, c;
 
   printf("Enter the number of rows you wish to see in pascal

   triangle\n");
   scanf("%d",&n);
 
   for ( i = 0 ; i < n ; i++ )
   {
      for ( c = 0 ; c <= ( n - i - 2 ) ; c++ )
         printf(" ");
 
      for( c = 0 ; c <= i ; c++ )
         printf("%ld ",factorial(i)/(factorial(c)*factorial(i-c)));
 
      printf("\n");
   }
 
   return 0;
}
 
long factorial(int n)
{
   int c;
   long result = 1;
 
   for( c = 1 ; c <= n ; c++ )
         result = result*c;
 
   return ( result );
}