int
printf(const char *, ...);

int
main()
{
    int x[5];

    // init x
    for (int i=0; i<5; ++i) {
        x[i] = i+1;
    }

    // print x
    for (int i=0; i<5; ++i) {
        printf("%5d ", x[i]);
    }
    printf("\n");

    // sum elements of x
    int sum = 0;
    for (int i=0; i<5; ++i) {
        sum += x[i];
    }

    printf("sum = %d\n", sum);
}