This document contains 14 C program examples that print various pyramid patterns. The programs demonstrate basic C programming concepts like loops, conditional statements, functions and demonstrate printing patterns using characters, numbers or both. Each program includes the code, comments on purpose and author. The output displayed below each program code verifies the pattern printed. Overall the document serves as a learning resource for basic C programming and pattern printing techniques.

1. Simple C Program :
Program :
/* Simple C Program .
Creation Date : 12:34 PM 07/11/2010
Author : R.K.Singh*/
#include <stdio.h>
#include <conio.h>
void main()
{
clrscr();
printf("n My first program in C !");
getch();
}

2. Output :
My first program in C !_

3. Program to print value of existing
number :
Program :
/* Program to print value of existing number .
Creation Date : 12:38 PM 07/11/2010
Author :R.K.Singh */
#include <stdio.h>
#include <conio.h>
void main()
{
int no = 19;
clrscr();
printf("n Number is : %d",no);
getch();
}

4. Output :
Number is : 19 !_

5. Program to demonstrate scanf()
and printf() : 3.C :
Program :
/* Program to demonstrate scanf() and printf().
Creation Date : 12:41 PM 07/11/2011
Author : R.K.Singh */
#include <stdio.h>
#include <conio.h>
void main()
{
int no;
clrscr();
printf("n Enter any number :");
scanf("%d",&no);
printf("n Number is : %d",no);
getch();
}

6. Output :
Enter any number :12
Number is : 12_

7. Operators

8. Program to calculate addition of two
numbers :
Program :
/* Program to calculate addition of two numbers.
Creation Date : 09:51 PM 21/11/2011
Author : R.K.Singh */
#include <stdio.h>
#include <conio.h>
void main()
{
int a,b,c;
clrscr();
printf("n Enter any 2 numbers : ");
scanf("%d %d",&a,&b);
c = a + b;
printf("n Addition is : %d",c);
getch();
}

9. Output :
Enter any 2 numbers : 12 14
Addition is : 26_

10. Program to calculate subtraction of two
numbers :
/* Program to calculate subtraction of two numbers.
Creation Date : 10:43 PM 21/11/2011
Author : R.K.Singh */
#include <stdio.h>
#include <conio.h>
void main()
{
int a,b,c;
clrscr();
printf("n Enter any 2 numbers : ");
scanf("%d %d",&a,&b);
c = a - b;
printf("n Subtraction is : %d",c);
getch();
}

11. Output :
Enter any 2 numbers : 8 6
Subtraction is : 2_

12. Program to calculate division of two
numbers :
Program :
/* Program to calculate division of two numbers.
Creation Date : 10:58 PM 21/11/2011
Author : R.K.Singh */
#include <stdio.h>
#include <conio.h>
void main()
{
int a,b,c;
clrscr();
printf("n Enter any 2 numbers : ");
scanf("%d %d",&a,&b);
c = a / b;
printf("n Division is : %d",c);
getch();
}

13. Output :
Enter any 2 numbers : 12 5
Division is : 2_

14. Program to calculate multiplication of
two numbers :
• Program :
• /* Program to calculate multiplication of two numbers.
• Creation Date : 10:51 PM 21/11/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• int a,b,c;
• clrscr();
• printf("n Enter any 2 numbers : ");
• scanf("%d %d",&a,&b);
• c = a * b;
• printf("n Multiplication is : %d",c);
• getch();
• }

15. Output :
Enter any 2 numbers : 8 12
Multiplication is : 96_

16. Program to calculate modulus of two
numbers :
• Program :
• /* Program to calculate modulus of two numbers.
• Creation Date : 11:01 PM 21/11/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• int a,b,c;
• clrscr();
• printf("n Enter any 2 numbers : ");
• scanf("%d %d",&a,&b);
• c = a % b;
• printf("n Modulus is : %d",c);
• getch();
• }

17. Output :
Enter any 2 numbers : 11 5
Modulus is : 1_

18. Pyramid in c

19. Program to print pyramid in C :
Pattern 1 :
• Program :
• /* Program to print pyramid pattern in C : Pattern 1
• Creation Date : 12:36 AM 22/11/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• int i,j;
• clrscr();
• for(i=0; i<5; i++)
• {
• for(j=0; j<5; j++)
• {
• printf(" * ");
• }
• printf("n");
• }
• getch();
• }

20. Output :
* * * * *
* * * * *
* * * * *
* * * * *
* * * * *_

21. Program to print pyramid in C :
Pattern 2 :
• Program :
• /* Program to print pyramid pattern in C : Pattern 2
• Creation Date : 12:43 AM 22/11/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• int i,j;
• clrscr();
• for(i=0; i<5; i++)
• {
• for(j=0; j<=i; j++)
• {
• printf(" * ");
• }
• printf("n");
• }
• getch();
• }

22. Output :
*
* *
* * *
* * * *
* * * * *_

23. Program to print pyramid in C :
Pattern 3 :• /* Program to print pyramid pattern in C : Pattern 3
• Creation Date : 12:28 AM 22/11/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• int i,j,k;
• clrscr();
• for(i=1; i<=5; i++)
• {
• for(j=5; j>=i; j--)
• {
• printf(" ");
• }
• for(k=1; k<=i; k++)
• {
• printf("*");
• }
• printf("n");
• }
• getch();
• }

24. Output :
*
* *
* * *
* * * *
* * * * *_

25. Program to print pyramid in C :
Pattern 4 :• /* Program to print pyramid pattern in C : Pattern 4
• Creation Date : 12:54 AM 22/11/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• int i,j,k,samp=1;
• clrscr();
• for(i=5; i>=1; i--)
• {
• for(k=samp; k>=0; k--)
• {
• printf(" "); // only 1 space
• }
• for(j=i; j>=1; j--)
• {
• printf("*");
• }
• samp = samp + 1;
• printf("n");
• }
• getch();
• }

26. Output :
* * * * *
* * * *
* * *
* *
*_

27. Program to print pyramid in C :
Pattern 5 :
• Program :
• /* Program to print pyramid pattern in C : Pattern 5
• Creation Date : 01:08 AM 22/11/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• int i,j;
• clrscr();
• for(i=5; i>=1; i--)
• {
• for(j=1; j<=i; j++)
• {
• printf(" * ");
• }
• printf("n");
• }
• getch();
• }

28. Output :
* * * * *
* * * *
* * *
* *
*_

29. Program to print pyramid in C :
Pattern 6 :
• Program :
• /* Program to print pyramid pattern in C : Pattern 6
• Creation Date : 01:52 AM 22/11/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• int i,j,k,t=0;
• clrscr();
• for(i=1; i<=5; i++)
• {
• for(k=t; k<5; k++)
• {
• printf(" ");
• }
• for(j=0; j< i; j++)
• {
• printf(" * ");
• t = t + 1;
• }
• printf("n");
• }
• getch();
• }

30. Output :
*
* *
* * *
* * * *
* * * * *_

31. Program to print pyramid in C :
Pattern 7 :• Program :
• /* Program to print pyramid pattern in C : Pattern 7
• Creation Date : 01:13 AM 22/11/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• int i,j,k,samp=1;
• clrscr();
• for(i=1; i<=5; i++)
• {
• for(k=samp; k<=5; k++)
• {
• printf(" ");
• }
• for(j=0; j< i; j++)
• {
• printf("*");
• }
• samp = samp + 1;
• printf("n");
• }
• samp = 1;
• for(i=4; i>=1; i--)
• {
• for(k=samp; k>=0; k--)
• {
• printf(" ");
• }
• for(j=i; j>=1; j--)
• {
• printf("*");
• }
• samp = samp + 1;
• printf("n");
• }
• getch();
• }
•

32. Output :
*
* *
* * *
* * * *
* * * * *
* * * *
* * *
* *
*_

33. Program to print pyramid in C :
Pattern 8 :
• Program :
• /* Program to print pyramid pattern in C : Pattern 8
• Creation Date : 02:39 PM 01/10/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• int rw, c, no=1 ,len;
• clrscr();
• printf("Enter number of rows: ");
• scanf("%d," &len);
• for(rw=1; rw<=len; rw++)
• {
• printf("n");
• for(c=1; c<=rw; c++)
• {
• printf(" %2d ", no);
• no++;
• }
• }
• getch();
• }

34. Output :
Enter number of rows: 5
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15_

35. Program to print pyramid in C :
Pattern 9 :• Program :
• /* Program to print pyramid pattern in C : Pattern 9
• Creation Date : 03:19 PM 01/10/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• int no,i,y,x=35;
• clrscr();
• printf("Enter number of rows: ");
• scanf("%d," &no);
• for(y=0;y<=no;y++)
• {
• goto(x,y+1);
• for(i=0-y; i<=y; i++)
• {
• printf(" %3d ", abs(i));
• x=x-3;
• }
• }
• getch();
• }

36. Output :
Enter number of rows: 5
0
1 0 1
2 1 0 1 2
3 2 1 0 1 2 3
4 3 2 1 0 1 2 3 4
5 4 3 2 1 0 1 2 3 4 5_

37. Program to print pyramid in C :
Pattern 10 :
• Program :
• /* Program to print pyramid pattern in C : Pattern 10
• Creation Date : 03:14 PM 01/10/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• int i, j=5, k, x;
• clrscr();
• for(i=1;i<=5;i++)
• {
• for(k=1;k<=j;k++)
• {
• printf(" ");
• }
• for(x=1;x<=i;x++)
• {
• printf("%d",i);
• printf(" ");
• }
• printf("n");
• j=j-1;
• }
• getch();
• }

38. Output :
1
2 2
3 3 3
4 4 4 4
5 5 5 5 5_

39. Program to print pyramid in C :
Pattern 11 :• Program :
• /* Program to print pyramid pattern in C : Pattern 11
• Creation Date : 03:24 PM 01/10/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• int rw,c,no,spc;
• clrscr();
• printf("Enter number of rows : ");
• scanf("%d", &no);
• for(rw=1; rw<=no; rw++)
• {
• for(spc=no; spc>=rw; spc--)
• {
• printf(" ");
• }
• for(c=1; c<=rw; c++)
• {
• printf("%2d",c);
• }
• printf("n");
• }
• getch();
• }

40. Output :
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5_

41. Program to print pyramid in C :
Pattern 12 :
• Program :
• /* Program to print pyramid pattern in C : Pattern 12
• Creation Date : 03:24 PM 01/10/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• int i,j,k;
• clrscr();
• for(i=1; i<=5; i++)
• {
• for(j=1; j<=5-i; j++)
• {
• printf(" ");
• }
• for(k=1; k<=2*i-1; k++)
• {
• printf(" %d ",k);
• }
• printf("n");
• }
• getch();
• }

42. Output :
1
1 2 3
1 2 3 4 5
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8 9_

43. Program to print pyramid in C :
Pattern 13 :
• Program :
• /* Program to print pyramid pattern in C : Pattern 13
• Creation Date : 04:24 PM 01/10/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• int i,j,asci,spc;
• clrscr();
• for(i=7; i>=1; i--)
• {
• for(spc=6; spc>=i; spc--)
• {
• printf(" ");
• }
• asci=65;
• for(j=1; j<=i; j++)
• {
• printf("%2c",asci++);
• }
• for(j=i-1; j>=0; j--)
• {
• printf("%2c",--asci);
• }
• printf("n");
• }
• getch();
• }

44. Output :
A B C D E F G G F E D C B A
A B C D E F F E D C B A
A B C D E E D C B A
A B C D D C B A
A B C C B A
A B B A
A A_

45. Program to all Combinations of
characters A,B,C in C : Pattern 14 :
• Program :
• /* Program to print all Combinations of characters
A, B, C : Pattern 14
• Creation Date : 11:33 PM 01/10/2011
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
• void main()
• {
• char ch1, ch2, ch3;
• clrscr();
• for(ch1='A' ; ch1<='C' ; ++ch1)
• {
• for(ch2='A' ; ch2<='C' ; ++ch2)
• {
• for(ch3='A' ; ch3<='C' ; ++ch3)
• {
• printf(" %c%c%c", ch1, ch2, ch3);
• }
• }
• }
• getch();
• }

46. Output :
AAA AAB AAC ABA ABB ABC ACA ACB ACC BAA BAB BAC BBA BBB
BBC BCA BCB BCC CAA CAB CAC CBA CBB CBC CCA CCB CCC_

47. Addition of two matrices :

48. Program :
/* Program to demonstrate addition of two matrices. Creation Date : 25 Nov 2011 11:35:00 PM
Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
•
• void main()
• {
• int a[3][3],b[3][3],c[3][3],i,j;
• clrscr();
• printf("nt Enter First Matrix : ");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• scanf("%d",&a[i][j]);
• }
• }
• printf("nt Enter Second Matrix : ");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• scanf("%d",&b[i][j]);
• }
• }
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• c[i][j]=a[i][j]+b[i][j];
• }
• }
• printf("nt Matrix Addition is : nn");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• printf("t %d",c[i][j]);
• }
• printf("n");
• }
• getch();
• }

49. Output :
Enter First Matrix : 2 1 2
3 2 1
2 3 3
Enter Second Matrix : 2 1 0
2 3 0
1 1 2
Matrix Addition is :
4 2 2
5 5 1
3 4 5_

50. Subtraction of two matrices :
• Program :
•
• /* Program to demonstrate subtraction of two matrices.
• Creation Date : 25 Nov 2011 11:42:08 PM
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
•
• void main()
• {
• int a[3][3],b[3][3],c[3][3],i,j;
• clrscr();
• printf("nt Enter First Matrix : ");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• scanf("%d",&a[i][j]);
• }
• }
• printf("nt Enter Second Matrix : ");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• scanf("%d",&b[i][j]);
• }
• }
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• c[i][j]=a[i][j]-b[i][j];
• }
• }
• printf("nt Matrix Subtraction is : nn");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• printf("t %d",c[i][j]);
• }
• printf("n");
• }
• getch();
• }

51. Output :
Enter First Matrix : 2 1 2
3 2 1
2 3 3
Enter Second Matrix : 2 1 0
2 3 0
1 1 2
Matrix Subtraction is :
0 0 2
1 -1 1
1 2 1_

52. Multiplication of two matrices :• Program :
• /* Program to demonstrate multiplication of two matrices.
Creation Date : 25 Nov 2011 11:50:11 PM
Author : R.K.Singh */
#include <stdio.h>
• #include <conio.h>
• void main()
• {
• int a[3][3],b[3][3],c[3][3],i,j,k;
• clrscr();
• printf("nt Enter First Matrix : ");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• scanf("%d",&a[i][j]);
• }
• }
• printf("nt Enter Second Matrix : ");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• scanf("%d",&b[i][j]);
• }
• }
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• c[i][j]=0;
• for(k=0;k<3;k++)
• {
• c[i][j]=c[i][j]+a[i][k]*b[k][j];
• }
• }
• }
• printf("nt Matrix Multiplication is : nn");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• printf("t %d",c[i][j]);
• }
• printf("n");
• }
• getch();
• }

53. Output :
Enter First Matrix : 1 2 1
3 2 1
1 2 1
Enter Second Matrix : 3 3 3
1 2 1
1 1 1
Matrix Multiplication is :
6 8 6
12 14 12
6 8 6_

54. Transpose of matrix :• Program :
•
• /* Program to demonstrate transpose of matrix.
• Creation Date : 26 Nov 2011 12:03:59 PM
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
•
• void main()
• {
• int a[3][3],i,j;
• clrscr();
• printf("nt Enter Matrix : ");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• scanf("%d",&a[i][j]);
• }
• }
• printf("nt Transpose of Matrix is : nn");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• printf("t%d",a[j][i]);
• }
• printf("n");
• }
• getch();
• }

55. Output :
Enter Matrix : 2 1 2
3 2 1
2 3 3
Transpose of Matrix is :
2 3 2
1 2 3
2 1 3_

56. Check matrix is lower triangular or not :
• Program :
•
• /* Program to check lower triangular matrix or not.
• Creation Date : 26 Nov 2011 01:14:54 PM
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
•
• void main()
• {
• int a[3][3],i,j,flg=0;
• clrscr();
• printf("nt Enter 3*3 Matrix : ");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• scanf("%d",&a[i][j]);
• }
• }
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• if(a[i]<a[j] && a[i][j]==0)
• {
• flg=flg+1;
• }
• }
• }
• if(flg==3)
• printf("nn Lower triangular matrix !");
• else
• printf("nn Not lower triangular matrix !");
• getch();
• }

57. Output :
Enter 3*3 Matrix :
1 0 0
1 1 0
2 2 3
Lower triangular matrix !_

58. Check matrix is upper triangular or not :
• Program :
•
• /* Program to check upper triangular matrix or not.
• Creation Date : 26 Nov 2011 01:14:54 PM
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
•
• void main()
• {
• int a[3][3],i,j,flg=0;
• clrscr();
• printf("nt Enter 3*3 Matrix : ");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• scanf("%d",&a[i][j]);
• }
• }
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• if(a[i]>a[j] && a[i][j]==0)
• {
• flg=flg+1;
• }
• }
• }
• if(flg==3)
• printf("nn Upper triangular matrix !");
• else
• printf("nn Not Upper triangular matrix !");
• getch();
• }

59. Output :
Enter 3*3 Matrix :
1 2 3
0 1 1
0 0 3
Upper triangular matrix !_

60. Check matrix is unit/identity matrix or not :
• Program :
•
• /* Program to check unit/identity matrix or not.
• Creation Date : 26 Nov 2011 08:28:08 PM
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
•
• void main()
• {
• int a[3][3],i,j,flg=0,flg2=0,flg3=0;
• clrscr();
• printf("nt Enter 3*3 Matrix : ");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• scanf("%d",&a[i][j]);
• }
• }
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• if(a[i]<a[j] && a[i][j]==0)
• {
• flg=flg+1;
• }
• if(a[i]>a[j] && a[i][j]==0)
• {
• flg2=flg2+1;
• }
• if(a[i][j]==1)
• {
• flg3=flg3+1;
• }
• }
• }
• if(flg==3 && flg2==3 && flg3==3)
• printf("nn Unit/Identity matrix !");
• else
• printf("nn Not Unit/Identity matrix !");
• getch();
• }

61. Output :
Enter 3*3 Matrix :
1 0 0
0 1 0
0 0 1
Unit/Identity matrix !_

62. Check matrix is zero/null matrix or not :
• Program :
•
• /* Program to check zero/null matrix or not.
• Creation Date : 26 Nov 2011 02:09:04 PM
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
•
• void main()
• {
• int a[3][3],i,j,flg=0;
• clrscr();
• printf("nt Enter 3*3 Matrix : ");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• scanf("%d",&a[i][j]);
• }
• }
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• if(a[i][j]==0)
• {
• flg=flg+1;
• }
• }
• }
• if(flg==9)
• printf("nn Zero/Null matrix !");
• else
• printf("nn Not Zero/Null matrix !");
• getch();
• }

63. Output :
Enter 3*3 Matrix :
0 0 0
0 0 0
0 0 0
Zero/Null matrix !_

64. Check matrix is diagonal or not :
• Program :
•
• /* Program to check diagonal matrix or not.
• Creation Date : 26 Nov 2011 01:14:54 PM
• Author : R.K.Singh */
• #include <stdio.h>
• #include <conio.h>
•
• void main()
• {
• int a[3][3],i,j,flg=0,flg2=0;
• clrscr();
• printf("nt Enter 3*3 Matrix : ");
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• scanf("%d",&a[i][j]);
• }
• }
• for(i=0;i<3;i++)
• {
• for(j=0;j<3;j++)
• {
• if(a[i]<a[j] && a[i][j]==0)
• {
• flg=flg+1;
• }
• if(a[i]>a[j] && a[i][j]==0)
• {
• flg2=flg2+1;
• }
• }
• }
• if(flg==3 && flg2==3)
• printf("nn Diagonal matrix !");
• else
• printf("nn Not Diagonal matrix !");
• getch();
• }
•

65. Output :
Enter 3*3 Matrix :
2 0 0
0 5 0
0 0 1
Diagonal matrix !_