Triangle Patterns using Loops in C

Example 1: Program to print half pyramid using *

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

Code

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

Code

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

Code

#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 *

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

Code

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

Code

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

Example 6: Program to print full pyramid using *

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

Code

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

Code

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

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

Code

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

Code

#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

Code

#include <stdio.h> int main() { int rows, i, j, number= 1; printf("Enter number of rows: "); scanf("%d",&rows); for(i=1; i <= rows; i++) { for(j=1; j <= i; ++j) { printf("%d ", number++); } printf("\n"); } return 0; }

Example 11: Print Diamond.

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

Code

#include <stdio.h> int main() { int i, j, k, n; printf("Enter n: "); scanf("%d",&n); for(i=0;i<n;++i) { for(j=0;j<n-i;j++) { printf(" "); } for(k=0;k<=2*i;k++) { printf("*"); } printf("\n"); } n=n-1; for(i=0;i<n;++i) { for(j=n-i-1;j<=n;j++) { printf(" "); } for(k=2*(n-i-1);k>=0;k--) { printf("*"); } printf("\n"); } return 0; }

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