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+#include <stdio.h>
+#include <time.h>
+
+// 应用3x3 GaussianBlur到给定的二维数组src上，并将结果存到二维数组dst中
+void applyGaussianBlur(float src[][5], float dst[][5], int h, int w, float kernel[3][3]) {
+    int i, j;  // 在函数开头声明循环变量，符合C89要求
+    for (i = 1; i < h - 1; ++i) {
+        for (j = 1; j < w - 1; ++j) {
+            dst[i][j] = 
+                src[i - 1][j - 1] * kernel[0][0] + src[i - 1][j] * kernel[0][1] + src[i - 1][j + 1] * kernel[0][2] +
+                src[i][j - 1] * kernel[1][0] + src[i][j] * kernel[1][1] + src[i][j + 1] * kernel[1][2] +
+                src[i + 1][j - 1] * kernel[2][0] + src[i + 1][j] * kernel[2][1] + src[i + 1][j + 1] * kernel[2][2];
+        }
+    }
+}
+
+int main() {
+    float inputImage[5][5] = {
+        {1, 2, 3, 4, 5},
+        {6, 7, 8, 9, 10},
+        {11, 12, 13, 14, 15},
+        {16, 17, 18, 19, 20},
+        {21, 22, 23, 24, 25}
+    };
+    float kernel[3][3] = {
+        {1.0f / 16, 2.0f / 16, 1.0f / 16},
+        {2.0f / 16, 4.0f / 16, 2.0f / 16},
+        {1.0f / 16, 2.0f / 16, 1.0f / 16}
+    };
+    float outputImage[5][5];
+    int i, j;  // 在函数开头声明循环变量，符合C89要求
+
+    // 计时开始
+    clock_t start_time = clock();
+
+    applyGaussianBlur(inputImage, outputImage, 5, 5, kernel);
+
+    // 计时结束
+    clock_t end_time = clock();
+    double elapsed_time = ((double)(end_time - start_time)) / CLOCKS_PER_SEC;
+
+    // 输出结果矩阵
+    printf("经过GaussianBlur后的图像矩阵：\n");
+    for (i = 0; i < 5; ++i) {
+        for (j = 0; j < 5; ++j) {
+            printf("%.2f ", outputImage[i][j]);
+        }
+        printf("\n");
+    }
+
+    // 输出运行时间
+    printf("运行时间：%.6f 秒\n", elapsed_time);
+
+    return 0;
+}