- C++ Programming Examples
- C++ Programming Examples
- C++: Hello World
- C++: Get Input
- C++: Print Integer
- C++: Add two numbers
- C++: Add, Sub, Multiply, Div
- C++: Add Digits
- C++: Find Average and Percentage
- C++: Find Arithmetic Mean
- C++: Sum of n Natural Numbers
- C++: Sum of n Numbers
- C++: Square's Area and Perimeter
- C++: Rectangle's Area and Perimeter
- C++: Triangle's Area and Perimeter
- C++: Area and Circumference
- C++: Find Simple Interest
- C++: Fahrenheit to Celsius
- C++: Celsius to Fahrenheit
- C++: Print Prime Numbers
- C++: Reverse a Number
- C++: Swap Two Numbers
- C++: Print Multiplication Table
- C++: Find Factorial of a Number
- C++: Find Factors of a Number
- C++: Find HCF and LCM
- C++: Create a Calculator
- C++: Count Digits in a Number
- C++: First and Last Digit Sum
- C++: Product of Number Digits
- C++: Sum of Squares of Digits
- C++: Interchange Digits of Number
- C++ if-else Programs
- C++: Check Even or Odd
- C++: Check Prime or Not
- C++: Check Alphabet or Not
- C++: Check Vowel or Not
- C++: Check Leap Year or Not
- C++: Check Reverse equals Original
- C++: Check Perfect Number
- C++: Check Palindrome or Not
- C++: Check Armstrong or Not
- C++: Divisibility Test
- C++: Find Labor Wage
- C++: Find Discounted Price
- C++: Find Shipping Charge
- C++: Find Telephone Bills
- C++: Calculate Student Grade
- C++: Largest of Two Numbers
- C++: Largest of Three Numbers
- C++ Number Conversion
- C++: Decimal to Binary
- C++: Decimal to Octal
- C++: Decimal to Hexadecimal
- C++: Binary to Decimal
- C++: Binary to Octal
- C++: Binary to Hexadecimal
- C++: Octal to Decimal
- C++: Octal to Binary
- C++: Octal to Hexadecimal
- C++: Hexadecimal to Decimal
- C++: Hexadecimal to Binary
- C++: Hexadecimal to Octal
- C++ Pattern Programs
- C++: Pattern Programs
- C++: Print Diamond Pattern
- C++: Print Floyd's Triangle
- C++: Print Pascal's Triangle
- C++ Array Programs
- C++: 1D Array Program
- C++: Linear Search
- C++: Binary Search
- C++: Largest Element in an Array
- C++: Smallest Element in an Array
- C++: Find Second Largest Element
- C++: Find Second Smallest Element
- C++: Sum of All Elements
- C++: Multiply All Elements
- C++: Element in Even Position
- C++: Element in Odd Position
- C++: Print Even Numbers in Array
- C++: Print Odd Numbers in Array
- C++: Count Even or Odd Numbers
- C++: Sum of Even or Odd Numbers
- C++: Count Positive, Negative, Zero
- C++: Reverse an Array
- C++: Insert an Element
- C++: Delete an Element
- C++: Merge two Arrays
- C++: Bubble Sort
- C++: Selection Sort
- C++: Insertion Sort
- C++: Common Elements
- C++: 2D Array Programs
- C++: Add Two Matrices
- C++: Subtract Two Matrices
- C++: Transpose Matrix
- C++: Multiply Two Matrices
- C++: 3D Array Programs
- C++ String Programs
- C++: Print String
- C++: Find String Length
- C++: Compare Two Strings
- C++: Copy String
- C++: String Concatenation
- C++: Reverse a String
- C++: Delete Vowels from a String
- C++: Delete a Word from a String
- C++: Count Characters in a String
- C++: Count Words in a String
- C++: Frequency of Words
- C++: Remove Spaces from Strings
- C++: Sort a String
- C++: Uppercase to Lowercase
- C++: Lowercase to Uppercase
- C++: Swap Two Strings
- C++: Check the Anagram or Not
- C++: Capitalize All Words in a String
- C++: Get Numbers from a String
- C++ File Programs
- C++: Read a File
- C++: Write Content to a File
- C++: Append Data to a File
- C++: Read and Display File
- C++: Copy a File
- C++: Merge Two Files
- Count Characters in a File
- C++: Capitalize Every Word
- C++: List Files in Directory
- C++: Delete a File
- C++: Encrypt and Decrypt a File
- C++ Misc Programs
- C++: Print ASCII Value
- C++: Add Binary Numbers
- C++: Generate Random Numbers
- C++: Print a Smiling Face
- C++: Days into Years and Months
- C++: Add Two Numbers using Pointer
- C++: Print Fibonacci Series
- C++: Generate Armstrong Numbers
- C++: Find nCr and nPr
- C++: Get IP Address
- C++: Print Date and Time
- C++: Shutdown and Restart Computer
- C++ Programming Tutorial
- C++ Tutorial
C++ Program to Multiply Two Matrices
In this article, you will learn and get code on matrix multiplication in C++. Here is the list of programs on matrix multiplication available in this article:
- Multiply two 3*3 matrices. A 3*3 matrix is a matrix with three rows and three columns
- Multiply two matrices with the same size (dimension)
Before going through these programs, if you're not aware of the steps used to multiply two matrices, refer to matrix multiplication steps to get all the information you need about matrix multiplication.
Matrix Multiplication in C++
To multiply two matrices in C++ programming, you have to ask the user to enter elements for both the first and second matrix. Now apply the formula to multiply two matrices and initialize the multiplication result's element to the third matrix one by one as shown in the program given below.
This program does not allow the user to enter the matrix size; instead, it requests 9 elements for the first matrix and 9 elements for the second 3*3 matrix. Later on, the same program that allows you to enter the size of the matrix is given.
The question is, "Write a program in C++ to multiply two matrices." Here is its answer:
#include<iostream> using namespace std; int main() { int matOne[3][3], matTwo[3][3], matThree[3][3]; int i, j, k, sum=0; cout<<"Enter 9 Elements for First Matrix: "; for(i=0; i<3; i++) { for(j=0; j<3; j++) cin>>matOne[i][j]; } cout<<"\nEnter 9 Elements for Second Matrix: "; for(i=0; i<3; i++) { for(j=0; j<3; j++) cin>>matTwo[i][j]; } // Multiplying two matrices... for(i=0; i<3; i++) { for(j=0; j<3; j++) { sum=0; for(k=0; k<3; k++) sum = sum + (matOne[i][k] * matTwo[k][j]); matThree[i][j] = sum; } } cout<<"\nMultiplication Result:\n"; for(i=0; i<3; i++) { for(j=0; j<3; j++) cout<<matThree[i][j]<<"\t"; cout<<endl; } cout<<endl; return 0; }
This Program was built and runs under the Code::Blocks IDE. Here is its sample run:
Now supply or enter nine numbers for the first matrix's nine elements, and nine numbers for the second matrix's nine elements. And then press the ENTER key to multiply both the matrices and print the third matrix (which stores the multiplication result of the two given matrices), as shown in the snapshot given below:
Multiply Two Matrices of a Given Size in C++
This program multiplies two matrices of a given size that the user specifies at run-time. That is, in addition to asking to enter elements for both matrices, this program first receives the size and then asks to enter elements of the given size for both the first and second matrix.
#include<iostream> using namespace std; int main() { int matOne[10][10], matTwo[10][10], matThree[10][10]; int matOneRow, matOneCol, matTwoRow, matTwoCol; int i, j, k, sum; cout<<"Enter the Row Size of First Matrix: "; cin>>matOneRow; cout<<"Enter the Column Size of First Matrix: "; cin>>matOneCol; cout<<"\nEnter "<<matOneRow*matOneCol<<" Elements for First Matrix: "; for(i=0; i<matOneRow; i++) { for(j=0; j<matOneCol; j++) cin>>matOne[i][j]; } cout<<"\nEnter the Row Size of Second Matrix: "; cin>>matTwoRow; cout<<"Enter the Column Size of Second Matrix: "; cin>>matTwoCol; cout<<"\nEnter "<<matTwoRow*matTwoCol<<" Elements for Second Matrix: "; for(i=0; i<matTwoRow; i++) { for(j=0; j<matTwoCol; j++) cin>>matTwo[i][j]; } if(matOneCol != matTwoRow) { cout<<"\nMultiplication Not Possible!\n"; return 0; } // Multiplying the two matrix... for(i=0; i<matOneRow; i++) { for(j=0; j<matTwoCol; j++) { sum = 0; for(k=0; k<matOneCol; k++) sum = sum + (matOne[i][k] * matTwo[k][j]); matThree[i][j] = sum; } } cout<<"\nMultiplication Result:\n"; for(i=0; i<matOneRow; i++) { for(j=0; j<matTwoCol; j++) cout<<matThree[i][j]<<"\t"; cout<<endl; } cout<<endl; return 0; }
Here is its sample run with the following user inputs:
- 2 as the size of the row for the first matrix
- 3 as the size of the column for the first matrix
- 1, 2, 3, 4, 5, 6 as six elements for the first matrix
- 3 as the size of the row for the second matrix
- 2 as the column size for the second matrix
- 7, 8, 9, 10, 11, 12 as six elements for the second matrix
After providing these inputs, press the ENTER key to multiply the two given matrices and print the multiplication result as shown in the sample output given below:
Note: To define matrix multiplication, the number of columns in the first matrix must be equal to the number of rows in the second matrix.
Therefore, before starting the multiplication, we checked whether the value of matOneCol was equal to the value of matTwoRow or not. If the condition is met, matrix multiplication cannot be defined; otherwise, define matrix multiplication and print the result as shown in the preceding program.
The same program in different languages
« Previous Program Next Program »