+ 1

write a c++ code playground to multiply a*b matrices and store the result in matrix c ?

19th Nov 2016, 6:01 PM
cyreen
cyreen - avatar
5 ответов
+ 5
Hello @cyreen here is your code, I have also posted code on my profile check it out and try your self to determine logic. #include <iostream> using namespace std; int main() { int a[3][3],b[3][3],c[3][3]; cout<<"Enter data for matrix-a:"; for(int i=0;i<3;i++) for (int j=0;j<3;j++) cin>>a[i][j]; cout<<"Enter data for matrix-b:"; for(int i=0;i<3;i++) for (int j=0;j<3;j++) cin>>b[i][j]; cout<<endl; //print matrix-a data cout<<"Matrix -a:"<<endl; for (int i=0;i<3;i++) { for (int j=0;j<3;j++) { cout<<a[i][j]<<" "; } cout<<endl; } //print matrix-b cout<<"Matrix -b:"<<endl; for (int i=0;i<3;i++) { for (int j=0;j<3;j++) { cout<<b[i][j]<<" "; } cout<<endl; } //multiply matrix a and matrix b for(int i = 0; i < 3; ++i) { for(int j = 0; j < 3; ++j) { c[i][j] = 0; for(int k = 0; k < 3; ++k) { c[i][j] += a[i][k] * b[k][j]; } } } // print multiplied matrix cout<<"Matrix-c data are:"<<endl; for (int i=0;i<3;i++) { for (int j=0;j<3;j++) { cout<<c[i][j]<<" "; } cout<<endl; } return 0; }
19th Nov 2016, 6:31 PM
Vishal Koshti
Vishal Koshti - avatar
+ 3
yes of course @cyreen I've minimized the code on my profile you can copy that: program name: Matrix multiplication
19th Nov 2016, 6:58 PM
Vishal Koshti
Vishal Koshti - avatar
+ 1
Thank you Vishal 😘 but it's too long , i want short solution if you can . thank you again my love 🙌
19th Nov 2016, 6:36 PM
cyreen
cyreen - avatar
+ 1
Ok Vishal 😘
19th Nov 2016, 7:03 PM
cyreen
cyreen - avatar
0
To multiply an m×n matrix by an n×p matrix, the n must be the same, and the result is an m×p matrix. The time complexity of this c program is O(n3). For Example: If we multiply a 2×4 matrix and a 4×3 matrix, then the product matrix will be a 2×3 matrix. Here is the code snippet to multiply two matrices. /* Multiply both matrices */ for(i = 0; i < rows1; i++){ for(j = 0; j < rows2; j++){ for(k = 0; k < cols2; k++){ productMatrix[i][j] += firstMatrix[i][k]*secondMatrix[k][j]; } } } You can check full c/C++ program here http://www.techcrashcourse.com/2015/03/c-program-for-matrix-multiplication.html http://www.techcrashcourse.com/2017/01/cpp-program-to-multiply-two-matrices.html
15th Apr 2017, 1:32 PM
Arun Kumar
Arun Kumar - avatar