Initial data commit

Task/Identity-matrix/C/identity-matrix.c

@@ -0,0 +1,38 @@
+#include <stdlib.h>
+#include <stdio.h>
+int main(int argc, char** argv) {
+   if (argc < 2) {
+      printf("usage: identitymatrix <number of rows>\n");
+      exit(EXIT_FAILURE);
+   }
+   int rowsize = atoi(argv[1]);
+   if (rowsize < 0) {
+      printf("Dimensions of matrix cannot be negative\n");
+      exit(EXIT_FAILURE);
+   }
+   int numElements = rowsize * rowsize;
+   if (numElements < rowsize) {
+      printf("Squaring %d caused result to overflow to %d.\n", rowsize, numElements);
+      abort();
+   }
+   int** matrix = calloc(numElements, sizeof(int*));
+   if (!matrix) {
+      printf("Failed to allocate %d elements of %ld bytes each\n", numElements, sizeof(int*));
+      abort();
+   }
+   for (unsigned int row = 0;row < rowsize;row++) {
+      matrix[row] = calloc(numElements, sizeof(int));
+      if (!matrix[row]) {
+         printf("Failed to allocate %d elements of %ld bytes each\n", numElements, sizeof(int));
+         abort();
+      }
+      matrix[row][row] = 1;
+   }
+   printf("Matrix is: \n");
+   for (unsigned int row = 0;row < rowsize;row++) {
+      for (unsigned int column = 0;column < rowsize;column++) {
+         printf("%d ", matrix[row][column]);
+      }
+      printf("\n");
+   }
+}