Question

Line number 9 contains the code line that declares the result array ( asked in another question of this exam). On Line number 11 where col_ contains the correct statement ( asked in another question of this exam) Question: Write the codeline (single line) to compute the matrix multiplication of "frstMatrix" and "scndMatrix". For this question you will write a code line for line number 17 1 package ok4; 2 //This java program multiplies two matrices 3 //represented with two 2-dimensional arrays. 4 public class multiply{ 5 public static void main(String[] args) { 6 int frstMatrix[][] = {{1,9,3},{0,-3,14}}; 7 int send Matrix[][] = {{0,7,10,-1},{24,3,4,1},{5,16,2,7}}; 8 9 // Here exists the code line for "result” array declaration 10 11 for(int col = 0; col <. -; col++) 12 { 13 for(int row = 0; row < frstMatrix.length; row++) 14 { 15 result[row][col] = 0; 16 for(int common = 0; common < frstMatrix[0].length; common++){ 17 code line for matrix multiplication 18 } 19 20 } 21 22 } 23 24 } 25 }

Answer 1

Answer:

Complete code:

package ok4;

public class multiply{
   public static void main(String[] args){
int frstMatrix[][]={{1, 9, 3},{0, -3, 14}};
int scndMatrix[][]={{0,7,10,-1},{24,3,4,1},{5,16,2,7}};
int result[][]=new int[frstMatrix.length][scndMatrix[0].length];

for(int col=0;col<scndMatrix[0].length;col++){
    for(int row=0;row<frstMatrix.length;row++){
        result[row][col]=0;
         for(int common=0;common<frstMatrix[0].length;common++){
           result[row][col] += frstMatrix[row][common]*scndMatrix[common][col];
         }
    }
}
System.out.println("Displaying the matrixes: ");
System.out.println("First Matrix:");
for(int i=0;i<frstMatrix.length;i++){
   for(int j=0;j<frstMatrix[0].length;j++)
     System.out.print(frstMatrix[i][j]+" ");
    System.out.println();
}
System.out.println("Second Matrix:");
for(int i=0;i<scndMatrix.length;i++){
   for(int j=0;j<scndMatrix[i].length;j++)
     System.out.print(scndMatrix[i][j]+" ");
    System.out.println();
}
    System.out.println("Result Matrix:");

for(int i=0;i<result.length;i++){
   for(int j=0;j<result[i].length;j++)
     System.out.print(result[i][j]+" ");
    System.out.println();
}

}
}

Explanation:

• I have highlighted the missing code.
• I have provided complete code to multiply two matrix and display each matrix.
• Two matrix can be multiplied only if column count of first matrix is equal to row count of second matrix.
• Output screen shot:
•