diff --git a/步骤七.cpp b/步骤七.cpp
new file mode 100644
index 0000000..d7d81c2
--- /dev/null
+++ b/步骤七.cpp
@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#define SIZE 100  
+
+void matmul(float A[SIZE][SIZE], float B[SIZE][SIZE], float C[SIZE][SIZE], int n) {
+    for (int i = 0; i < n; i++) {
+        for (int j = 0; j < n; j++) {
+            float sum = 0.0f;
+            for (int k = 0; k < n; k++) {
+                sum += A[i][k] * B[k][j];
+            }
+            C[i][j] = sum;
+        }
+    }
+}
+
+int main() {
+    float A[SIZE][SIZE], B[SIZE][SIZE], C[SIZE][SIZE];
+
+  
+    srand(time(NULL)); 
+    for (int i = 0; i < SIZE; i++) {
+        for (int j = 0; j < SIZE; j++) {
+            A[i][j] = rand() % 101;  
+            B[i][j] = rand() % 101;
+            C[i][j] = 0;  
+        }
+    }
+
+    
+    matmul(A, B, C, SIZE);
+
+
+    printf("Result matrix C (partial):\n");
+    for (int i = 0; i < 10; i++) {
+        for (int j = 0; j < 10; j++) {
+            printf("%.2f ", C[i][j]);
+        }
+        printf("\n");
+    }
+
+    return 0;
+}
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