Question

Correct C++ function and main files separately for the following question and its subparts.

1-aGiven a matrix of integers, count the amount of times each number 0-9 appears. Print out your results on one line in the following form:

0:number of zeros;1:number of ones;2:number of twos;3:number of threes;4:number of fours;5:number of fives;6:number of sixes;7:number of sevens;8:number of eights;9:number of nines;

For example, if you are passed an identify matrix, it contains 12 zeros and 4 ones and no other numbers from 0 to 9, your output would be:

0:12;1:4;2:0;3:0;4:0;5:0;6:0;7:0;8:0;9:0;

Note the colons and semi-colons.

Signature: void count_numbers(int array[4][4])

1-b Given a matrix, print out the scaled version of the matrix, where you multiply every element in the matrix by the same numeric value. Elements should be printed by row, with a space separating elements on a row, and a newline character separating rows.

Example:

int scale = 3 ;
int threebythree[3][3] = {{0,1,2},{3,4,5},{6,7,8}} ;
print_scaled_matrix(threebythree,scale) ;

This should produce the following output:

0 3 6
9 12 15
18 21 24

Signature: void print_scaled_matrix(int array[3][3],int scale)

1-c Given two two-dimensional arrays, add them together and print the result as in 1-b above. What relationship needs to be between the sizes of the two matrices?

Example:

int matrix1[3][3] = {{0,1,2},{3,4,5},{6,7,8}} ;
int matrix2[3][3] = {{0,0,0},{2,2,2},{-5,-4,8}} ;
print_summed_matrices(matrix1,matrix2) ;

This should produce the following output:

0 1 2
5 6 7
1 3 16

Signature: void print_summed_matrices(int array1[3][3],int array2[3][3])

Answer 1

#include<iostream>
using namespace std;
//1a
//Given a matrix of integers, count the amount of times each number 0-9 appears.
void Count(int m[][3],int scale)
{
   int a[10];
   for(int i=0;i<10;i++)a[i]=0;
   for(int i=0;i<scale;i++)
   for(int j=0;j<scale;j++)
   a[m[i][j]]++;
  
   for(int i=0;i<10;i++)
   cout<<i<<":"<<a[i]<<";";
   cout<<endl;
  
}

int main()
{
   int matrix1[3][3] = {{0,1,2},{3,4,5},{6,7,8}} ;

  
   Count(matrix1,3);
  
   return 0;
}

output:

0:1;1:1;2:1;3:1;4:1;5:1;6:1;7:1;8:1;9:0;

Process exited normally.
Press any key to continue . . .

#include<iostream>
using namespace std;

//1b
void print_scaled_matrix(int m[][3],int scale)
{
   for(int i=0;i<scale;i++){
  
   for(int j=0;j<scale;j++)
   cout<<m[i][j]<<" ";
   cout<<endl;
   }
}

int main()
{
   int matrix1[3][3] = {{0,1,2},{3,4,5},{6,7,8}} ;

  

   cout<<"Matrix:\n";
   print_scaled_matrix(matrix1,3);

   return 0;
}

output:

Matrix:
0 1 2
3 4 5
6 7 8

Process exited normally.
Press any key to continue . . .

#include<iostream>
using namespace std;

//1c
//adds two matrices
//their size should be same
void print_summed_matrices(int m1[][3],int m2[][3],int s1,int s2)
{
   if(s1==s2)
   {
       int r[s1][s2];
       for(int i=0;i<s1;i++)
   for(int j=0;j<s1;j++)
   r[i][j]=m1[i][j]+m2[i][j];
       cout<<"After addition :\n";
   for(int i=0;i<s1;i++)
   {for(int j=0;j<s1;j++)
   cout<<r[i][j]<<" ";
   cout<<endl;
   }
   }
  
}
int main()
{
   int matrix1[3][3] = {{0,1,2},{3,4,5},{6,7,8}} ;
   int matrix2[3][3] = {{0,0,0},{2,2,2},{-5,-4,8}} ;
  

   print_summed_matrices(matrix1,matrix2,3,3);
   return 0;
}

output:

After addition :
0 1 2
5 6 7
1 3 16

Process exited normally.
Press any key to continue . . .