# Problem Set 1

Assigned Wednesday, Sept 2nd

Do the following problems from Weiss:

• 1.16
• 1.17

## Solutions

1.16

```public class Prob1_16 {
public static void main(String[] args) {
System.out.print("   ");
for (int i = 1; i <= 9; i++) {
System.out.printf("%3d", i);
}
System.out.printf("\n");

for (int j = 1; j <= 9; j++) {
System.out.printf("%3d", j);
for (int i = 1; i <= 9; i++) {
System.out.printf("%3d", i + j);
}
System.out.printf("\n");
}

System.out.printf("\n");

System.out.printf("         --- Multiplication ---\n");
System.out.print("   ");
for (int i = 1; i <= 9; i++) {
System.out.printf("%3d", i);
}
System.out.printf("\n");

for (int j = 1; j <= 9; j++) {
System.out.printf("%3d", j);
for (int i = 1; i <= 9; i++) {
System.out.printf("%3d", i * j);
}
System.out.printf("\n");
}
}
}
```

1.17

```public class Prob1_17 extends TestCase {
public static int maxOf3(int a, int b, int c) {
return maxOf4(a, b, c, c);
}

public static int maxOf4(int a, int b, int c, int d) {
int max = a;
if (b > max) {
max = b;
}
if (c > max) {
max = c;
}
if (d > max) {
max = d;
}
return max;
}

public void testMaxOf3() throws Exception {
assertEquals(49, maxOf3(13, 49, 8));
assertEquals(-10, maxOf3(-10, -100, -53));
}

public void testMaxOf4() throws Exception {
assertEquals(81, maxOf4(52, 66, 81, 8));
assertEquals(1001, maxOf4(11, -4, 121, 1001));
}
}
```