Patterns in C

Patterns in C : This article is a complete source code library for every pattern program in C like number pattern programs, star (*) pattern programs, triangle or pyramid pattern programs, alphabet pattern programs.

    Number Pattern Programs
  1. Pascal's Triangle
  2. Floyd's Triangle
  3. Inverted Triangle
    4. Star * Pattern Programs
  4. Diamond
  5. Half Pyramid
  6. Inverted Pyramid
    7. Alphabets Pattern Programs
  7. Half Triangle Using Alphabet
  8. Inverted Triangle Using Alphabet

Diamond Pattern in C

    *
   ***
  *****
 *******
*********
 *******
  *****
   ***
    *
Here is the source code of c program to print or the display diamond pattern using stars. 
#include<stdio.h>

int main()
{
  int i,n,j,s=1;

  printf("\n Enter number of rows:- ");
  scanf("%d",&n);

  printf("\n This is the diamond pattern in stars: \n");

  s=n-1;

  for(j=1;j<=n;j++)
  {
	for(i=1;i<=s;i++)
	  printf(" ");

	s--;

	for(i=1;i<=2*j-1;i++)
	  printf("*");

	printf("\n");
  }

	s=1;

  for(j=1;j<=n-1;j++)
  {
	for(i=1;i<=s;i++)
	  printf(" ");

	s++;

	for(i=1;i<=2*(n-j)-1;i++)
	  printf("*");

	printf("\n");

  }

  return 0;
}

/* Output of above code:-

 Enter number of rows:- 5

 This is the diamond pattern in stars:

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

*/
If you want the algorithm or general idea behind how to print diamond pattern in C visit - C program to print diamond pattern

Print Pascal's Triangle in C

           1
         1   1
       1   2   1
     1   3   3    1
   1  4    6   4   1
 1  5   10   10  5   1
Here is the source code to print Pascal's triangle in C. 
#include<stdio.h>

int main()
{
  int i, j, coeff = 1, space;

  printf("\n Enter number of rows:- ");
  scanf(" %d",&rows);

  for(i=0; i<rows; i++)
  {
	for(space=1; space <= rows-i; space++)
		printf("  ");

	for(j=0; j <= i; j++)
	{
		if (j==0 || i==0)
			coeff = 1;
		else
			coeff = coeff*(i-j+1)/j;
		printf("%4d", coef);
	}
	printf("\n");
  }

  return 0;
}

/* Output of above code:-

           1
         1   1
       1   2   1
     1   3   3    1
   1  4    6   4   1
 1  5   10   10  5   1

*/

Program to Print Floyd's Triangle in C

  1
 
  2  3
 
  4  5  6

  7  8  9 10
Here is the source code of C program to print half triangle of numbers. 
#include<stdio.h>

int main()
{
  int i,j,c=0;

  printf("\n");

  for(i=1;i<=4;i++)
  {
	for(j=1;j<=i;j++)
		printf(" %d",c++);
		printf("\n \n");	
  }

  return 0;

}

/* Output of above code:-

  1
 
  2  3
 
  4  5  6

  7  8  9  10

*/

Program to Print half Triangle (Pyramid) Pattern using Stars (*) in C

  *
 
  *  *
 
  *  *  *
Here is the source code of C program to print half triangle of stars (*). 
#include<stdio.h>

int main()
{
  int i,j,c=0;

  printf("\n");

  for(i=1;i<=3;i++)
  {
	for(j=1;j<=i;j++)
		printf(" %d",c++);
		printf("\n \n");	
  }

  return 0;
}

/* Output of above code:-

  *
 
  *  *
 
  *  *  *

*/

Print Star Triangle or Pyramid in C

    *
   ***
  *****
 *******
*********
Here is the source code of conduct program to print full triangle or pyramid using stars (* 🌟). 
#include<stdio.h>

int main()
{
  int row, cols, size, sp;

  printf("\n Enter number of rows to print star triangle:- ");
  scanf("%d", &size);
  
  sp = size;

  for(row = 1; row <= size; row++)
  {
	for (cols = 1; cols < sp; cols++)
	printf(" ");

	sp--;

	for (cols = 1; cols <= 2*row - 1; cols++)
		printf("*");
	printf("\n");
  }
 
  return 0;
}

Program to Print half Triangle (Pyramid) Pattern Using Alphabets in C

A 
B C 
D E F
Here is the source code of C program to print half triangle of alphabets. 
#include<stdio.h>

int main()
{
  int c,a,e,l,num,m;
 
  e=64;
  printf("\n");

  for (l=1;l<=3;l++)
  {
	for (num=e+1;num<=e+l;num++)
		printf("%c\t",num);
		printf("\n");
	e=e+l;
  }

  printf("\n");

}

/* Output of above code:-

A 
B C 
D E F

*/

Program to Print Inverted half Triangle (Pyramid) Number Pattern in C

1 2 3 4 
1 2 3
1 2
1
Here is the source code C program to print inverted half triangle using *. 
#include<stdio.h>

int main()
{ 
  int i,j; 

  printf("\n");

  for (i=4;i>=1;i--)
  {
	for (j=1;j<=i;j++)
		printf(" %d\t",j);
		printf("\n");
  }

  printf("\n");

  return 0;
}

/* Output of above code:- 

1 2 3 4 
1 2 3
1 2
1

*/

Program to Print Inverted half Triangle (Pyramid) Pattern using Stars (*) in C

* * * * 
* * * 
* * 
*
Here is the source code C program to print inverted half triangle using *. 
#include<stdio.h>

int main()
{ 
  int i,j; 

  printf("\n");

  for (i=4;i>=1;i--)
  {
	for (j=1;j<=i;j++)
		printf("*\t");
		printf("\n");
  }

  printf("\n");

  return 0;
}

/* Output of above code:- 

* * * * 
* * * 
* * 
* 

*/

Program to Print Inverted half Triangle (Pyramid) using Alphabets in C

A B C D 
A B C 
A B 
A
Here is the source code of Conduct program to print inverted half trainlge using alphabets. 
#include <stdio.h>
#include <stdlib.h>

int main()
{ 
  int c,a,e,n,l,num;
 
  printf("\n How many lines:- ");
  scanf("%d",&n); 
  printf("\n");

  if ((n>26) || (n<=0)) 
  {
	printf("\n Error:You can specify only 26 l asines. please specify a numeric value \n \n");
	exit(1);
  }

  for (l=n;l>=1;l--)
  {
	e=64+l;
	for (num=65;num<=e;num++)
		printf("%c\t",num);
		printf("\n");
  }

  printf("\n");L;

  return 0;
}

/* Output of above code:

 How many lines:- 4

A B C D 
A B C 
A B 
A 
*/
Putting too much pattern programs in one post will make it heavy to load so take a lot at other pattern programs that are implemented in C :
Infix to Postfix conversion in C is done by taking the priority of operators in consideration. We will consider the priority of operators as follows:
  1. Brackets
  2. Exponential (^ or $)
  3. Arithmetic (*,/,%)
  4. Arithmetic (+, -)

Infix to Postfix Conversion in C

For example, let the infix expression be A+B*C. In this infix expression * will be converted first and + will be converted last, this is usual thing.

Let us do this step by step,
A+B*C
A+BC* - B, C operands are combined and * is written on right side. Now A and BC* are two operands.
ABC*+ - Now combine A and BC* and write + on right hand side

ABC*+ is the postfix expression of given infix expression.

Infix to Postfix Program in C

Here is the source code of C program to convert infix to postfix using stack. 
#include<studio.h>

#define SIZE 100

typedef strict 
{
	int data[SIZE];
	int top;
}STACK;

void initStack(STACK *pt)
{
	pt->top = -1;
}

int isEmpty(STACK *pt)
{
	return(pt->top==-1);
}

int isFull(STACK *pt)
{
	return(pt->top==SIZE-1);
}

int pop(STACK *pt)
{
	return(pt->data[pt->top--]);
}

void push(STACK *pt, int n)
{
	pt->data[++pt->top] = n
}

int stackTop(STACK *pt)
{
	return(pt->data[pt->top]);
}

int priority(char ch)
{
  switch(ch)
  {
	case '(': return 0;
	case '+':
	case '-': return 1;
	case '*':
	case '/':
	case '%': return 2;
  }
  
  return 0;
}

void infixToPostfix(char infix[100], char postfix[100])
{
  char ch, ch2;
  int i, j = 0;

  STACK s;

  initStack(&s);

  for(i=0;infix[i]!='\0';i++)
  {
	ch = infix[i];

	switch (ch)
	{
	  case '(': push(&s, ch);
	    break;

	  case '+':
	  case '-':
	  case '*':
	  case '/':
	  case '%':
	    if(isEmpty(&s)
	      push(&s,ch);
	    else
	    {
	      while(priority (stackTop(&s)) >= priority (ch))
		    postfix[j++] = pop(&s);
	      push(&s, ch);
	    }
	    break;

	  case ')':
	    while(ch1 = pop(&s)!='(')
	      postfix [j++] = ch1;
	    break;

	  default: postfix[j++] = ch;
	}
  }

  while(! isEmpty(&s))
	postfix[j++] = pop(&s);

  postfix[j] = '\0';

}

int main()
{
  char infix[100], postfix [100];

  printf("\n Enter the infix expression:- ");
  scanf(" %s",infix);

  convert(infix, postfix);

  printf("\n The Postfix String is %s ", postfix);

  return 0;
}

/* Output of above code:-


 Enter the infix expression:- A+B*C
 The Postfix String is ABC*+ 


*/

Labels:











Labels