# Java Test 1

From Progzoo

State the output from this program fragment:

int a = 5; int b = 7; a = a + b; b = a + b;

State the output from this program fragment:

int a = 5; int b = 7; int c = 8; a = b; b = c; c = a; System.out.println(100*a+10*b+c)

State the output from this program fragment:

String s = "Fourty two"; String t = s.substring(7,8)+substring(1,4); System.out.println(t);

The program fragment and the output are shown. State the missing value for q

Program Fragment |
for(int i=q; i<9; i+=3) System.out.print("x"); |
---|---|

Output | xxxx |

The program fragment and the output are shown. State the highest possible value for q.

Program Fragment |
for(int i=q; i<9; i+=3) System.out.print("x"); |
---|---|

Output | xxx |

The program fragment and the output are shown. State the highest possible value for q.

Program Fragment |
int i = 0; System.out.print("x"); |
---|---|

Output | xx |

Evaluate

15-5*2

Evaluate

(1+3)*(4-2)

Evaluate

int i = 7+2*3-6/4

Evaluate

The ternary expression B ? X : Y gives X if B is true and Y if B is false.

1>3?6:8

Evaluate

(2<3||6>7)?(1==1?3:4):5

Evaluate

(0==1?2>3:4>5)?6:7

Evaluate

0==1?2>3:4<5?6:7

Evaluate

The binary operator << is bit-shift-let. The expression A << B evaluates to A*2^B

((1<<3)+1)<<2

Evaluate

(123<<7)/((123<<3)<<3)

Evaluate

(123<<7)/((1<<3)<<3)

The array a is defined as: int a[] = {4,2,8,6,9,1,3,0,7,5};

Evaluate

a[2]+1

Evaluate

a[a[3]]

Evaluate

a[a[a[a[0]]]]

Give the output of the following program fragment:

int x[] = {1,3,0,2}; int b = 0; for (int i=0;i<161;i++) b = x[b]; System.out.println(b);

The array y is such that y[x[i]] == i for all values of i from 0 to 3

Evaluate y[0]+y[2]