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step3.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+
+#define SIZE 1024
+
+void matmul(float** A, float** B, float** C, int n) {
+	int i,j,k;
+    for (i = 0; i < n; i++) {
+        for (j = 0; j < n; j++) {
+            C[i][j] = 0;
+            for (k = 0; k < n; k++) {
+                C[i][j] += A[i][k] * B[k][j];
+            }
+        }
+    }
+}
+
+int main() {
+    srand(time(NULL));
+    float** A = (float**)malloc(SIZE * sizeof(float*));
+    float** B = (float**)malloc(SIZE * sizeof(float*));
+    float** C = (float**)malloc(SIZE * sizeof(float*));
+int i;
+    for (i = 0; i < SIZE; i++) {
+        A[i] = (float*)malloc(SIZE * sizeof(float));
+        B[i] = (float*)malloc(SIZE * sizeof(float));
+        C[i] = (float*)malloc(SIZE * sizeof(float));
+    }
+int j;
+    for (i = 0; i < SIZE; i++) {
+        for (j = 0; j < SIZE; j++) {
+            A[i][j] = rand() % 100;
+            B[i][j] = rand() % 100;
+        }
+    }
+
+    clock_t start = clock();
+    matmul(A, B, C, SIZE);
+    clock_t end = clock();
+
+    double time_taken = (double)(end - start) / CLOCKS_PER_SEC;
+    printf(" %f s\n", time_taken);
+
+    for (i = 0; i < SIZE; i++) {
+        free(A[i]);
+        free(B[i]);
+        free(C[i]);
+    }
+    free(A);
+    free(B);
+    free(C);
+
+    return 0;
+}