Data commit

Task/Pascal-matrix-generation/C/pascal-matrix-generation.c

@@ -0,0 +1,73 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+void pascal_low(int **mat, int n) {
+    int i, j;
+
+    for (i = 0; i < n; ++i)
+        for (j = 0; j < n; ++j)
+            if (i < j)
+                mat[i][j] = 0;
+            else if (i == j || j == 0)
+                mat[i][j] = 1;
+            else
+                mat[i][j] = mat[i - 1][j - 1] + mat[i - 1][j];
+}
+
+void pascal_upp(int **mat, int n) {
+    int i, j;
+
+    for (i = 0; i < n; ++i)
+        for (j = 0; j < n; ++j)
+            if (i > j)
+                mat[i][j] = 0;
+            else if (i == j || i == 0)
+                mat[i][j] = 1;
+            else
+                mat[i][j] = mat[i - 1][j - 1] + mat[i][j - 1];
+}
+
+void pascal_sym(int **mat, int n) {
+    int i, j;
+
+    for (i = 0; i < n; ++i)
+        for (j = 0; j < n; ++j)
+            if (i == 0 || j == 0)
+                mat[i][j] = 1;
+            else
+                mat[i][j] = mat[i - 1][j] + mat[i][j - 1];
+}
+
+int main(int argc, char * argv[]) {
+    int **mat;
+    int i, j, n;
+
+    /* Input size of the matrix */
+    n = 5;
+
+    /* Matrix allocation */
+    mat = calloc(n, sizeof(int *));
+    for (i = 0; i < n; ++i)
+        mat[i] = calloc(n, sizeof(int));
+
+    /* Matrix computation */
+    printf("=== Pascal upper matrix ===\n");
+    pascal_upp(mat, n);
+    for (i = 0; i < n; i++)
+        for (j = 0; j < n; j++)
+            printf("%4d%c", mat[i][j], j < n - 1 ? ' ' : '\n');
+
+    printf("=== Pascal lower matrix ===\n");
+    pascal_low(mat, n);
+    for (i = 0; i < n; i++)
+        for (j = 0; j < n; j++)
+            printf("%4d%c", mat[i][j], j < n - 1 ? ' ' : '\n');
+
+    printf("=== Pascal symmetric matrix ===\n");
+    pascal_sym(mat, n);
+    for (i = 0; i < n; i++)
+        for (j = 0; j < n; j++)
+            printf("%4d%c", mat[i][j], j < n - 1 ? ' ' : '\n');
+
+    return 0;
+}