#include <stdio.h>

void calculate(int a[3][4])
{
    int i, j;
    int sum;

    for (i = 0; i < 3; i++) {

        sum = 0;

        for (j = 0; j < 4; j++) {
            sum = sum + a[i][j];
        }

        printf("行%dの合計 = %d\n", i, sum);
    }
}

int main(void)
{
    int a[3][4] = {
        {1, 2, 3, 4},
        {5, 6, 7, 8},
        {9, 10, 11, 12}
    };

    calculate(a);

    return 0;
}