#include <stdio.h>

void calculate(int (*a)[4]) {
    for (int i=0;i<3;i++){     
        int sum=0;
        for (int j=0;j<4;j++){
            sum += a[i][j];
        }
        printf("%d = %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;
}