# Generating Inverse Hollow Pyramid Pattern Using Stars

Matrix multiplication

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+#include <stdio.h>
+
+int main()
+{
+  int m, n, p, q, c, d, k, sum = 0;
+  int first[10][10], second[10][10], multiply[10][10];
+
+  printf("Enter number of rows and columns of first matrix\n");
+  scanf("%d%d", &m, &n);
+  printf("Enter elements of first matrix\n");
+
+  for (c = 0; c < m; c++)
+    for (d = 0; d < n; d++)
+      scanf("%d", &first[c][d]);
+
+  printf("Enter number of rows and columns of second matrix\n");
+  scanf("%d%d", &p, &q);
+
+  if (n != p)
+    printf("The multiplication isn't possible.\n");
+  else
+  {
+    printf("Enter elements of second matrix\n");
+
+    for (c = 0; c < p; c++)
+      for (d = 0; d < q; d++)
+        scanf("%d", &second[c][d]);
+
+    for (c = 0; c < m; c++) {
+      for (d = 0; d < q; d++) {
+        for (k = 0; k < p; k++) {
+          sum = sum + first[c][k]*second[k][d];
+        }
+
+        multiply[c][d] = sum;
+        sum = 0;
+      }
+    }
+
+    printf("Product of the matrices:\n");
+
+    for (c = 0; c < m; c++) {
+      for (d = 0; d < q; d++)
+        printf("%d\t", multiply[c][d]);
+
+      printf("\n");
+    }
+  }
+
+  return 0;
+}

c/Tower of Hanoi in C

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+#include<stdio.h>
+void TOH(int n,char x,char y,char z) {
+   if(n>0) {
+      TOH(n-1,x,z,y);
+      printf("\n%c to %c",x,y);
+      TOH(n-1,z,y,x);
+   }
+}
+int main() {
+   int n=3;
+   TOH(n,'J','K','L');
+}

c/c:Tower of Hanoi in C

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+#include<stdio.h>
+void TOH(int n,char x,char y,char z) {
+   if(n>0) {
+      TOH(n-1,x,z,y);
+      printf("\n%c to %c",x,y);
+      TOH(n-1,z,y,x);
+   }
+}
+int main() {
+   int n=3;
+   TOH(n,'J','K','L');
+}

python/patterns/Pattern.py

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+# Generating Inverse Hollow Pyramid Pattern Using Stars
+
+row = int(input('Enter number of rows required: '))
+
+for i in range(row,0,-1):
+    for j in range(row-i):
+        print(' ', end='') # printing space and staying in same line
+
+    for j in range(2*i-1):
+        if i==0 or i==row or j==2*i-2 or j==0:
+            print('*',end='') # printing * and staying in same line
+        else:
+            print(' ', end='') # printing space and staying in same line
+    print() # printing new line