update

ch3/05CvsCPP/matrix_multiply.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#define N 500  // 使用500x500矩阵进行测试
+
+void multiply(int mat1[][N], int mat2[][N], int res[][N]) {
+    int i, j, k;
+    for (i = 0; i < N; i++) {
+        for (j = 0; j < N; j++) {
+            res[i][j] = 0;
+            for (k = 0; k < N; k++)
+                res[i][j] += mat1[i][k] * mat2[k][j];
+        }
+    }
+}
+
+int main() {
+    int mat1[N][N], mat2[N][N], res[N][N];
+    srand(time(NULL));
+
+    // 初始化矩阵
+    for (int i = 0; i < N; i++) {
+        for (int j = 0; j < N; j++) {
+            mat1[i][j] = rand() % 100;
+            mat2[i][j] = rand() % 100;
+        }
+    }
+
+    clock_t t;
+    t = clock();
+    multiply(mat1, mat2, res);
+    t = clock() - t;
+    double time_taken = ((double)t)/CLOCKS_PER_SEC; // 计算运行时间
+
+    printf("Matrix multiplication took %f seconds to execute \n", time_taken);
+    return 0;
+}

ch3/05CvsCPP/matrix_multiply.cpp

@@ -0,0 +1,38 @@
+#include <iostream>
+#include <vector>
+#include <cstdlib>
+#include <ctime>
+
+#define N 500  // 使用500x500矩阵进行测试
+
+void multiply(std::vector<std::vector<int>>& mat1, std::vector<std::vector<int>>& mat2, std::vector<std::vector<int>>& res) {
+    for (int i = 0; i < N; i++) {
+        for (int j = 0; j < N; j++) {
+            res[i][j] = 0;
+            for (int k = 0; k < N; k++)
+                res[i][j] += mat1[i][k] * mat2[k][j];
+        }
+    }
+}
+
+int main() {
+    std::vector<std::vector<int>> mat1(N, std::vector<int>(N)), mat2(N, std::vector<int>(N)), res(N, std::vector<int>(N));
+    srand(time(NULL));
+
+    // 初始化矩阵
+    for (int i = 0; i < N; i++) {
+        for (int j = 0; j < N; j++) {
+            mat1[i][j] = rand() % 100;
+            mat2[i][j] = rand() % 100;
+        }
+    }
+
+    clock_t t;
+    t = clock();
+    multiply(mat1, mat2, res);
+    t = clock() - t;
+    double time_taken = ((double)t)/CLOCKS_PER_SEC; // 计算运行时间
+
+    std::cout << "Matrix multiplication took " << time_taken << " seconds to execute \n";
+    return 0;
+}

ch3/05CvsCPP/test.py

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+import subprocess
+import time
+
+def compile_and_measure(program_name, language):
+    if language == "c":
+        compile_command = f"gcc -O2 {program_name}.c -o {program_name}"
+    elif language == "cpp":
+        compile_command = f"g++ -O2 {program_name}.cpp -o {program_name}"
+
+    # Measure compile time
+    compile_start = time.time()
+    subprocess.run(compile_command, shell=True, check=True)
+    compile_duration = time.time() - compile_start
+
+    # Run the program and measure the execution time
+    run_start = time.time()
+    result = subprocess.run(f"./{program_name}", shell=True, check=True, capture_output=True, text=True)
+    run_duration = time.time() - run_start
+
+    return compile_duration, run_duration, result.stdout
+
+def main():
+    c_compile_time, c_run_time, c_output = compile_and_measure("matrix_multiply", "c")
+    cpp_compile_time, cpp_run_time, cpp_output = compile_and_measure("matrix_multiply", "cpp")
+
+    print("C Program:")
+    print(f"Compile time: {c_compile_time:.4f} seconds")
+    print(f"Run time: {c_run_time:.4f} seconds")
+    print(c_output)
+
+    print("C++ Program:")
+    print(f"Compile time: {cpp_compile_time:.4f} seconds")
+    print(f"Run time: {cpp_run_time:.4f} seconds")
+    print(cpp_output)
+
+if __name__ == "__main__":
+    main()