Neste exemplo, você aprenderá a multiplicar duas matrizes e exibi-las usando a função definida pelo usuário.
Para entender este exemplo, você deve ter conhecimento dos seguintes tópicos de programação C:
- Matrizes C
- Arrays C Multidimensional
- Passe matrizes para uma função em C
Este programa pede ao usuário para inserir o tamanho da matriz (linhas e colunas).
Em seguida, ele pede ao usuário para inserir os elementos dessas matrizes e, finalmente, adiciona e exibe o resultado.
Para realizar esta tarefa, três funções são feitas:
- To pega os elementos da matriz do usuário
enterData() - Para multiplicar duas matrizes
multiplyMatrices() - Para exibir a matriz resultante após a multiplicação
display()
Exemplo: multiplique matrizes passando-as para uma função
#include 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; printf("Enter rows and column for first matrix: "); scanf("%d %d", &rowFirst, &columnFirst); printf("Enter rows and column for second matrix: "); scanf("%d %d", &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) ( printf("Error! column of first matrix not equal to row of second."); printf("Enter rows and column for first matrix: "); scanf("%d%d", &rowFirst, &columnFirst); printf("Enter rows and column for second matrix: "); scanf("%d%d", &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; printf("Enter elements of matrix 1:"); for(i = 0; i < rowFirst; ++i) ( for(j = 0; j < columnFirst; ++j) ( printf("Enter elements a%d%d: ", i + 1, j + 1); scanf("%d", &firstMatrix(i)(j)); ) ) printf("Enter elements of matrix 2:"); for(i = 0; i < rowSecond; ++i) ( for(j = 0; j < columnSecond; ++j) ( printf("Enter elements b%d%d: ", i + 1, j + 1); scanf("%d", &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
Output
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
