#include <stdio.h> int get_sum(int (*p)[4], int n) { int i, j, sum = 0; for(i = 0; i < n; i++) { for(j = 0; j < 4; j++) { sum += p[i][j]; } } return sum; } int main() { int a[3][4] = {{1,2,3,4}, {5, 6, 7, 8}, {9, 10, 11, 12}}; int s = get_sum(a, 3); printf("sum is %d\n", s); }