该程序要求用户输入矩阵的大小(行和列)。
然后,它要求用户输入两个矩阵的元素,最后将两个矩阵相乘并显示结果。
为了执行此任务,需要执行三个功能:
从用户获取矩阵元素
两个矩阵相乘
显示乘法后的结果矩阵
示例: 通过将矩阵传递给函数来乘以矩阵
#include <iostream> using namespace std; void enterData(int firstMatrix[][10], int secondMatrix[][10], int rowFirst, int columnFirst, int rowSecond, int columnSecond); void multiplyMatrices(int firstMatrix[][10], int secondMatrix[][10], int multResult[][10], int rowFirst, int columnFirst, int rowSecond, int columnSecond); void display(int mult[][10], int rowFirst, int columnSecond); int main() { int firstMatrix[10][10], secondMatrix[10][10], mult[10][10], rowFirst, columnFirst, rowSecond, columnSecond, i, j, k; cout << "Enter rows and column for first matrix: "; cin >> rowFirst >> columnFirst; cout << "Enter rows and column for second matrix: "; cin >> rowSecond >> columnSecond; // if colum of first matrix in not equal to row of second matrix, asking user to enter the size of matrix again. while (columnFirst != rowSecond) { cout << "Error! column of first matrix not equal to row of second." << endl; cout << "Enter rows and column for first matrix: "; cin >> rowFirst >> columnFirst; cout << "Enter rows and column for second matrix: "; cin >> rowSecond >> columnSecond; } // Function to take matrices data enterData(firstMatrix, secondMatrix, rowFirst, columnFirst, rowSecond, columnSecond); // Function to multiply two matrices. multiplyMatrices(firstMatrix, secondMatrix, mult, rowFirst, columnFirst, rowSecond, columnSecond); // Function to display resultant matrix after multiplication. display(mult, rowFirst, columnSecond); return 0; } void enterData(int firstMatrix[][10], int secondMatrix[][10], int rowFirst, int columnFirst, int rowSecond, int columnSecond) { int i, j; cout << endl << "Enter elements of matrix 1:" << endl; for(i = 0; i < rowFirst; ++i) { for(j = 0; j < columnFirst; ++j) { cout << "Enter elements a"<< i + 1 << j + 1 << ": "; cin >> firstMatrix[i][j]; } } cout << endl << "Enter elements of matrix 2:" << endl; for(i = 0; i < rowSecond; ++i) { for(j = 0; j < columnSecond; ++j) { cout << "Enter elements b" << i + 1 << j + 1 << ": "; cin >> secondMatrix[i][j]; } } } void multiplyMatrices(int firstMatrix[][10], int secondMatrix[][10], int mult[][10], int rowFirst, int columnFirst, int rowSecond, int columnSecond) { int i, j, k; // Initializing elements of matrix mult to 0. for(i = 0; i < rowFirst; ++i) { for(j = 0; j < columnSecond; ++j) { mult[i][j] = 0; } } // Multiplying matrix firstMatrix and secondMatrix and storing in array mult. for(i = 0; i < rowFirst; ++i) { for(j = 0; j < columnSecond; ++j) { for(k=0; k<columnFirst; ++k) { mult[i][j] += firstMatrix[i][k] * secondMatrix[k][j]; } } } } void display(int mult[][10], int rowFirst, int columnSecond) { int i, j; cout << "Output Matrix:" << endl; for(i = 0; i < rowFirst; ++i) { for(j = 0; j < columnSecond; ++j) { cout << mult[i][j] << " "; if(j == columnSecond-1) cout << endl << endl; } } }
输出
Enter rows and column for first matrix: 3 2 Enter rows and column for second matrix: 3 2 Error! column of first matrix not equal to row of second. Enter rows and column for first matrix: 2 3 Enter rows and column for second matrix: 3 2 Enter elements of matrix 1: Enter elements a11: 3 Enter elements a12:-2 Enter elements a13: 5 Enter elements a21: 3 Enter elements a22: 0 Enter elements a23: 4 Enter elements of matrix 2: Enter elements b11: 2 Enter elements b12: 3 Enter elements b21:-9 Enter elements b22: 0 Enter elements b31: 0 Enter elements b32: 4 Output Matrix: 24 29 6 25