#include <stdio.h>
#include <stdlib.h>
#define ROW 3
#define COLUMN 4
void toOneByRow(int[][], int[]);
void toOneByColumn(int[][], int[]);
int indexByRow(int, int);
int indexByColumn(int, int);
void toOne(int[][COLUMN], int[], int (*)(int, int));
int main(void) {
int arr1[ROW][COLUMN] = {{1, 2, 3, 4},
{5, 6, 7, 8},
{9, 10, 11, 12}};
int arr2[ROW * COLUMN] = {0};
printf("原二維資料：\n");
int row, column;
for(row = 0; row < 3; row++) {
for(column = 0; column < 4; column++) {
printf("%4d", arr1[row][column]);
}
printf("\n");
}
printf("\n以列為主：");
toOneByRow(arr1, arr2);
int i;
for(i = 0; i < 12; i++)
printf("%d", arr2[i]);
printf("\n以行為主：");
toOneByColumn(arr1, arr2);
for(i = 0; i < 12; i++)
printf("%d", arr2[i]);
printf("\n");
return 0;
}
void toOneByRow(int arr1[][COLUMN], int arr2[]) {
toOne(arr1, arr2, indexByRow);
}
void toOneByColumn(int arr1[][COLUMN], int arr2[]) {
toOne(arr1, arr2, indexByColumn);
}
int indexByRow(int row, int column) {
return column + row * COLUMN;
}
int indexByColumn(int row, int column) {
return row + column * ROW;
}
void toOne(int arr1[][COLUMN], int arr2[], int (*index)(int, int)) {
int row, column;
for(row = 0; row < ROW; row++) {
for(column = 0; column < COLUMN; column++) {
arr2[index(row, column)] = arr1[row][column];
}
}
}