72.C Programming Code To Create Pyramid and Pattern

C Programming Code To Create Pyramid and Pattern

Examples to print half pyramid, pyramid, inverted pyramid, Pascal's Triangle and Floyd's triangle in C Programming using control statements.

To understand this example, you should have the knowledge of following C programming topics:

• C if, if...else and Nested if...else Statement
• C Programming for Loop
• C programming while and do...while Loop
• C Programming break and continue Statement

List of Source Code
Code to print triangles using *, digits and characters
Code to print inverted triangles using * and digits
Code to print full pyramids
Code to print Pascal's triangle
Code to print Floyd's triangle

Programs to print triangles using *, numbers and characters

---

Example 1: Program to print half pyramid using *

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

#include <stdio.h>
int main()
{
    int i, j, rows;

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

    for(i=1; i<=rows; ++i)
    {
        for(j=1; j<=i; ++j)
        {
            printf("* ");
        }
        printf("\n");
    }
    return 0;
}

---

Example 2: Program to print half pyramid a using numbers

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

#include <stdio.h>
int main()
{
    int i, j, rows;

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

    for(i=1; i<=rows; ++i)
    {
        for(j=1; j<=i; ++j)
        {
            printf("%d ",j);
        }
        printf("\n");
    }
    return 0;
}

---

Example 3: Program to print half pyramid using alphabets

A
B B
C C C
D D D D
E E E E E

#include <stdio.h>
int main()
{
    int i, j;
    char input, alphabet = 'A';

    printf("Enter the uppercase character you want to print in last row: ");
    scanf("%c",&input);

    for(i=1; i <= (input-'A'+1); ++i)
    {
        for(j=1;j<=i;++j)
        {
            printf("%c", alphabet);
        }
        ++alphabet;

        printf("\n");
    }
    return 0;
}

Programs to print inverted half pyramid using * and numbers

---

Example 4: Inverted half pyramid using *

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

#include <stdio.h>
int main()
{
    int i, j, rows;

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

    for(i=rows; i>=1; --i)
    {
        for(j=1; j<=i; ++j)
        {
            printf("* ");
        }
        printf("\n");
    }
    
    return 0;
}

---

Example 5: Inverted half pyramid using numbers

1 2 3 4 5
1 2 3 4 
1 2 3
1 2
1

#include <stdio.h>
int main()
{
    int i, j, rows;

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

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

    return 0;
}

 Programs to display pyramid and inverted pyramid using * and digits

---

Example 6: Program to print full pyramid using *

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

#include <stdio.h>
int main()
{
    int i, space, rows, k=0;

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

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

        while(k != 2*i-1)
        {
            printf("* ");
            ++k;
        }

        printf("\n");
    }
    
    return 0;
}

---

Example 7: Program to print pyramid using numbers

        1
      2 3 2
    3 4 5 4 3
  4 5 6 7 6 5 4
5 6 7 8 9 8 7 6 5

#include <stdio.h>
int main()
{
    int i, space, rows, k=0, count = 0, count1 = 0;

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

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

        while(k != 2*i-1)
        {
            if (count <= rows-1)
            {
                printf("%d ", i+k);
                ++count;
            }
            else
            {
                ++count1;
                printf("%d ", (i+k-2*count1));
            }
            ++k;
        }
        count1 = count = k = 0;

        printf("\n");
    }
    return 0;
}

---

Example 8: Inverted full pyramid using *

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

#include<stdio.h>
int main()
{
    int rows, i, j, space;

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

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

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

        for(j=0; j < i-1; ++j)
            printf("* ");

        printf("\n");
    }

    return 0;
}

---

Example 9: Print Pascal's triangle

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

#include <stdio.h>
int main()
{
    int rows, coef = 1, space, i, j;

    printf("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)
                coef = 1;
            else
                coef = coef*(i-j+1)/j;

            printf("%4d", coef);
        }
        printf("\n");
    }

    return 0;
}

---

Example 10: Print Floyd's Triangle.

1
2 3
4 5 6
7 8 9 10

#include <stdio.h>
int main()
{
    int rows, i, j, number= 1;

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

    for(i=1; i <= rows; i++)
    {
        for(j=1; j <= i; ++j)
        {
            printf("%d ", number);
            ++number;
        }

        printf("\n");
    }

    return 0;
}

Check out these related examples:

• C Programming Code To Create Pyramid and Structure
• C Program to Multiply to Matrix Using Multi-dimensional Arrays
• C Program to Count Number of Digits in an Integer

71.C Program to Display its own Source Code as Output

C Program to Display its own Source Code as Output

In this example, you'll learn to display source of the program using __FILE__ macro.

To understand this example, you should have the knowledge of following C programming topics:

• C Preprocessor and Macros
• C Programming Files I/O

Though this problem seems complex but, the concept behind this program is very simple; display the content from the same file you are writing the source code.

A predefined macro __FILE__ contains the location of a C programming file, it is working on. For example:

#include <stdio.h>
int main(){
   printf("%s",__FILE__);
}

The output of this program is the location of this C programming file.

C program to display its own source code using __FILE__

#include <stdio.h>
int main() {
    FILE *fp;
    char c;
    fp = fopen(__FILE__,"r");
    do {
         c = getc(fp);
         putchar(c);
    }
    while(c != EOF);
    fclose(fp);
    return 0;
}

This program displays the content of this particular C programming file(source code) because __FILE__ contains the location of this C programming file in a string.

Check out these related examples:

• C Program to Read a Line From a File and Display it
• C Program to Write a Sentence to a File
• C Programming Code To Create Pyramid and Structure

70.C Program to Read a Line From a File and Display it

C Program to Read a Line From a File and Display it

This program reads text from a file and stores it in a string until enter 'newline' character is encountered.

To understand this example, you should have the knowledge of following C programming topics:

• C Programming Files I/O
• C Programming Strings

Example: Program to read text from a file

#include <stdio.h>
#include <stdlib.h> // For exit() function
int main()
{
    char c[1000];
    FILE *fptr;

    if ((fptr = fopen("program.txt", "r")) == NULL)
    {
        printf("Error! opening file");
        // Program exits if file pointer returns NULL.
        exit(1);         
    }

    // reads text until newline 
    fscanf(fptr,"%[^\n]", c);

    printf("Data from the file:\n%s", c);
    fclose(fptr);
    
    return 0;
}

If the file program.txt is not found, this program prints error message.

If the file is found, the program saves the content of the file to a string c until '\n' newline is encountered.

Suppose, the program.txt file contains following text.

C programming is awesome.
I love C programming.
How are you doing?

The output of the program will be:

Data from the file: C programming is awesome.

Check out these related examples:

• C Program to Write a Sentence to a File
• C Program to Display its own Source Code as Output
• C "Hello, World!" Program