In each of the following Java classes, point out the error and the first compilation stage where it is detected:

1)

class C1 { void example() { int i = 0; while ( i + 100 ) { i++; } } }

2)

class C2 { void example() { int i = 0; while ( i < 100 ) { i+; } } }

3)

class C3 { void example() { int i = 0; while ( i < 100 ) { i++; ) } }

4)

class C4 { void example() { int i = 0; while ( i < 100 ) { i+\; } } }

5)

class C5 { void example() { i = 0; while ( i < 100 ) { i++; } } }

6)

class C6 { void example() { int i; while ( i < 100 ) { i++; } } }

7)

class C7 { void example() { int i = 0; whil ( i < 100 ) { i++; } } }