old value: 1
new value: 100
old value: 1
new value: 100
old value: 1.0
new value: 100.0
old value: 1.0
new value: 100.0
old value: c
new value: 1
old value: a string
new value: 100
old value: true
new value: false
public static void foo2() {
    int negativeOne = -(-1);
}
