Question

How to search an element in a matrix with C++

Answer 1

#include <iostream>
 
#define COLS 5
  
bool found(int matrix[][COLS], int rows, int cols, int number) {
    if (rows == 0)
        return -1;
 
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++)
            if (matrix[i][j] == number) {
                std::cout << "Found at: " << i << ", " << j << "\n";
                return true;
            }
    }
 
    std::cout << "Not found";
    
    return false;
}
  
  
int main()
{
    int matrix[][COLS] = { { 1,   2,   3,   4,  0 },
                           { 5,   6, 100,   8,  1 },
                           { 2, 200,   8, 400,  3 },
                           { 1,   7, 300,   9,  6 },
                           { 9,  10,  11,  12, 13 } };
  
    int rows = sizeof matrix / sizeof matrix[0];
    int cols = sizeof matrix[0] / sizeof(int);
  
    std::cout << found(matrix, rows, cols, 8);
}
  
  
  
  
/*
run:
  
Found at: 1, 3
1
  
*/

 

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