#include <stdio.h>
#include <stdlib.h>
#include <time.h>
// predicate which determines if specified integer array has nonzero elements
bool has_nonzero(size_t size, int* row)
{
for (int* end = row + size; row < end; ++row)
if (*row)
return true;
return false;
}
// evaluate sum of a row
int sum(size_t size, int* row)
{
int s = 0;
for (int* end = row + size; row < end; ++row)
s += *row;
return s;
}
int main(int argc, char** argv)
{
int rows, columns;
// read matrix dimensions
if (argc < 3)
{
printf("Usage: <app> <rows> <columns>\n");
return 0;
}
sscanf(argv[1], "%d", &rows);
sscanf(argv[2], "%d", &columns);
// random seed
srand(time(0));
// create matrix and init it
int i;
printf("Creating matrix\n");
int** matrix = new int*[rows];
if (!matrix)
return 1;
printf("Matrix:\n");
for (i = 0; i < rows; ++i)
{
matrix[i] = new int[columns];
if (!matrix[i])
return 1;
int j;
for (j = 0; j < columns; ++j)
{
matrix[i][j] = (rand() % 10) - 4;
matrix[i][j] = matrix[i][j] <= 0 ? 0 : matrix[i][j] - 3;
printf("%d ", matrix[i][j]);
}
printf("\n");
}
// make sums
printf("Sums (per row):\n");
fflush(stdin);
int **end = matrix + rows;
for (int** row = matrix; row < end; ++row)
if (has_nonzero(columns, *row))
printf("%d: %d\n", row - matrix, sum(columns, *row));
//perform cleanup
for (i = 0; i < rows; i++)
delete[] matrix[i];
delete[] matrix;
return 0;
}
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