#include <stdio.h>
 
void calculate(int (*a)[4]) {
    int sum[3]; //行が３つ
 
    for (int i = 0; i < 3; i++) {//3行分繰り返す
        sum[i] = 0;
        for (int j = 0; j < 4; j++) { //４列分
            sum[i] += a[i][j];
        }
        printf("sum[%d] = %d\n", i, sum[i]);
    }
}
 
int main(void) {
    int a[3][4] = {
        {1, 2, 3, 4},
        {5, 6, 7, 8},
        {9,10,11,12}
    };
 
    calculate(a);
 
    return 0;
}

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