flc.c

C Primer Plus(第五版)中文版源码,I hope it will help you much

// flc.c -- funny-looking constants
#include <stdio.h>
#define COLS 4
int sum2d(int ar[][COLS], int rows); 
int sum(int ar[], int n);

int main(void)
{
     int total1, total2, total3;
     int * pt1;
     int (*pt2)[COLS];

     pt1 = (int [2]) {10, 20};
     pt2 = (int [2][COLS]) { {1,2,3,-9}, {4,5,6,-8} };
  
     total1 = sum(pt1, 2);
     total2 = sum2d(pt2, 2);
     total3 = sum((int []){4,4,4,5,5,5}, 6);
     printf("total1 = %d\n", total1); 
     printf("total2 = %d\n", total2); 
     printf("total3 = %d\n", total3); 
     
     return 0;
}

int sum(int ar[], int n)
{
    int i;
    int total = 0;

    for( i = 0; i < n; i++)
        total += ar[i];
        
    return total;
}

int sum2d(int ar[][COLS], int rows)
{
    int r;
    int c;
    int tot = 0;

    for (r = 0; r < rows; r++)
        for (c = 0; c < COLS; c++)
            tot += ar[r][c];
            
    return tot;
}