C 语言实例 - 两个矩阵相加

这是一篇关于C 语言实例 - 两个矩阵相加的思维导图，主要内容包括：方法2：使用指针和动态内存分配，方法1：使用二维数组和嵌套循环。

C 语言实例 - 两个矩阵相加

• 方法1：使用二维数组和嵌套循环
  • #include <stdio.h>
  • #define ROWS 3
  • #define COLS 3
  • void addMatrices(int a[ROWS][COLS], int b[ROWS][COLS], int result[ROWS][COLS]) {
    • for (int i = 0; i < ROWS; i++) {
      • for (int j = 0; j < COLS; j++) {
        • result[i][j] = a[i][j] + b[i][j];
      • }
    • }
  • }
  • void printMatrix(int matrix[ROWS][COLS]) {
    • for (int i = 0; i < ROWS; i++) {
      • for (int j = 0; j < COLS; j++) {
        • printf("%d ", matrix[i][j]);
      • }
      • printf("\n");
    • }
  • }
  • int main() {
    • int matrix1[ROWS][COLS] = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} };
    • int matrix2[ROWS][COLS] = { {9, 8, 7}, {6, 5, 4}, {3, 2, 1} };
    • int result[ROWS][COLS];
    • addMatrices(matrix1, matrix2, result);
    • printf("Matrix 1:\n");
    • printMatrix(matrix1);
    • printf("Matrix 2:\n");
    • printMatrix(matrix2);
    • printf("Resultant Matrix:\n");
    • printMatrix(result);
    • return 0;
  • }
• 方法2：使用指针和动态内存分配
  • #include <stdio.h>
  • #include <stdlib.h>
  • void addMatrices(int** a, int** b, int** result, int rows, int cols) {
    • for (int i = 0; i < rows; i++) {
      • for (int j = 0; j < cols; j++) {
        • result[i][j] = a[i][j] + b[i][j];
      • }
    • }
  • }
  • void printMatrix(int** matrix, int rows, int cols) {
    • for (int i = 0; i < rows; i++) {
      • for (int j = 0; j < cols; j++) {
        • printf("%d ", matrix[i][j]);
      • }
      • printf("\n");
    • }
  • }
  • int main() {
    • int rows = 3, cols = 3;
    • /*动态分配内存*/
    • int** matrix1 = (int**)malloc(rows * sizeof(int*));
    • int** matrix2 = (int**)malloc(rows * sizeof(int*));
    • int** result = (int**)malloc(rows * sizeof(int*));
    • for (int i = 0; i < rows; i++) {
      • matrix1[i] = (int*)malloc(cols * sizeof(int));
      • matrix2[i] = (int*)malloc(cols * sizeof(int));
      • result[i] = (int*)malloc(cols * sizeof(int));
    • }
    • /*初始化矩阵*/
    • for (int i = 0; i < rows; i++) {
      • for (int j = 0; j < cols; j++) {
        • matrix1[i][j] = i * cols + j + 1;
        • matrix2[i][j] = (rows * cols) - (i * cols + j);
      • }
    • }
    • addMatrices(matrix1, matrix2, result, rows, cols);
    • printf("Matrix 1:\n");
    • printMatrix(matrix1, rows, cols);
    • printf("Matrix 2:\n");
    • printMatrix(matrix2, rows, cols);
    • printf("Resultant Matrix:\n");
    • printMatrix(result, rows, cols);
    • /*释放内存*/
    • for (int i = 0; i < rows; i++) {
      • free(matrix1[i]);
      • free(matrix2[i]);
      • free(result[i]);
    • }
    • free(matrix1);
    • free(matrix2);
    • free(result);
    • return 0;
  • }