diff --git a/step1.c b/step1.c
new file mode 100644
index 0000000..43facbc
--- /dev/null
+++ b/step1.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#define SIZE 1024
+void vector_add(float* A, float* B, float* C, int size) {
+    int i;
+	for (i = 0; i < size; i++) {
+        C[i] = A[i] + B[i];
+    }
+}
+
+int main() {
+	int i;
+    float A[SIZE], B[SIZE], C[SIZE];
+    srand((unsigned int)time(NULL));
+    for (i = 0; i < SIZE; i++) {
+        A[i] = rand() % 100;
+        B[i] = rand() % 100;
+    }
+    clock_t start_time = clock();
+    vector_add(A, B, C, SIZE);
+    clock_t end_time = clock();
+    double elapsed_time = (double)(end_time - start_time) / CLOCKS_PER_SEC;
+    printf(" %f s\n", elapsed_time);
+    return 0;
+}