1 /*--------------------------------- 2     array2d.c -- 处理二维数组的函数 3 ---------------------------------*/ 4  5 #include 
      
        6 #define ROWS 3 7 #define COLS 4 8  9 void sum_rows(int ar[][COLS], int rows);10 void sum_cols(int [][COLS], int);11 int sum2d(int (*ar)[COLS], int rows);12 13 int main()14 {15     int junk[ROWS][COLS] =16     {17         {
    2, 4, 6, 8},18         {
    3, 5, 7, 9},19         {
    12, 10, 8, 6}20     };21 22     sum_rows(junk, ROWS);23     sum_cols(junk, ROWS);24     printf("Sum of all elements = %d\n", sum2d(junk, ROWS));25 26     return 0;27 }28 29 void sum_rows(int ar[][COLS], int rows)30 {31     for (int r(0); r != rows; ++r)32     {33         int total(0);34         for (int c(0); c != COLS; ++c)35             total += ar[r][c];36         printf("row %d: sum = %d\n", r, total);37     }38 }39 40 void sum_cols(int ar[][COLS], int rows)41 {42     for (int c(0); c != COLS; ++c)43     {44         int total(0);45         for (int r(0); r != rows; ++r)46             total += ar[r][c];47         printf("col %d: sum = %d\n", c, total);48     }49 }50 51 int sum2d(int ar[][COLS], int rows)52 {53     int total(0);54 55     for(int r(0); r != rows; ++r)56         for(int c(0); c != COLS; ++c)57             total += ar[r][c];58 59     return total;60 }