50. 2차원 배열 부분 초기화와 대각선 합

1#include <stdio.h>
2 
3int main() {
4    int a[3][4] = {{3, 1}, {4, 1, 5}, {9}};
5    int rows = sizeof(a) / sizeof(a[0]);
6    int cols = sizeof(a[0]) / sizeof(a[0][0]);
7    int total = 0;
8    for (int i = 0; i < rows; i++) {
9        int rowSum = 0;
10        for (int j = 0; j < cols; j++) {
11            rowSum += a[i][j];
12        }
13        printf("row%d=%d\n", i, rowSum);
14        total += rowSum;
15    }
16    int diag = 0;
17    for (int k = 0; k < rows; k++) {
18        diag += a[k][k] + a[k][cols - 1 - k];
19    }
20    printf("%d %d\n", total, diag);
21    return 0;
22}