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  1. #include <iostream>
  2. #include <iomanip>
  3.  
  4. int main(int argc, const char* argv[]) {
  5.     int total_rows, total_cols;
  6.  
  7.     std::cout << "Please enter number of rows: ";
  8.     std::cin >> total_rows;
  9.  
  10.     std::cout << "Please enter number of columns: ";
  11.     std::cin >> total_cols;
  12.  
  13.     int* matrix = new int[total_rows*total_cols];
  14.  
  15.     std::cout << "Initialize matrix: \n";
  16.  
  17.     for (int row = 0; row < total_rows; row++) {
  18.         for (int col = 0; col < total_cols; col++) {
  19.             std::cin >> matrix[col + row*total_rows];
  20.         }
  21.     }
  22.  
  23.     std::cout << "Matrix:\n";
  24.  
  25.     for (int row = 0; row < total_rows; row++) {
  26.         for (int col = 0; col < total_cols; col++) {
  27.             std::cout << std::setw(3) << matrix[col + row*total_rows];
  28.         }
  29.         std::cout << "\n";
  30.     }
  31.  
  32.     int row_number;
  33.     std::cout << "\nEnter row number (zero-based) to calculate sum for: ";
  34.     std::cin >> row_number;
  35.  
  36.     int sum = 0;
  37.     for (int col = 0; col < total_cols; col++) {
  38.         sum += matrix[col + row_number*total_cols];
  39.     }
  40.  
  41.     std::cout << "Sum = " << sum << "\n";
  42.  
  43.     delete[] matrix;
  44. }
Success #stdin #stdout 0s 3232KB
comments (?)
stdin 
4 4

 1  2  3  4
 5  6  7  8
 9 10 11 12
13 14 15 16

2
stdout 
Please enter number of rows: Please enter number of columns: Initialize matrix: 
Matrix:
  1  2  3  4
  5  6  7  8
  9 10 11 12
 13 14 15 16

Enter row number (zero-based) to calculate sum for: Sum = 42
https://ideone.com/R04o96
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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