WWW.TESTBENCH.IN - Vera Constructs

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Specman E
Interview Questions

CONTROL STATEMENTS
Sequential Statements:

Statements inside sequential control constructs are executed sequentially.

if-else Statement : The if-else statement is the general form of selection statement.

case Statement : The case statement provides for multi-way branching.

repeat loop : Repeat statements can be used to repeat the execution of a statement or statement block a fixed number of times.

for loop : The for construct can be used to create loops.

while loop : The loop iterates while the condition is true.

do-while : condition is checked after loop iteration.

foreach :ech construct specifies iteration over the elements of an single dimensional fixed-size arrays, dynamic arrays and SmartQs.

  Loop Control       :  The break and continue statements are used for flow control within loops.

EXAMPLE : if
program main {
   integer i;
   i = 20;
   if( i == 20)
   printf(" I is equal to %d ",i);
   else
   printf(" I is not equal to %d ",i);

}
RESULTS

I is equal to 20

EXAMPLE : case and repeat
program main {
integer i;

    repeat(10){
        i = random();
        case(1) {
        (i<0)   :printf(" i is less than zero i==%d\n",i);
        (i>0)   :printf(" i is grater than zero i=%d\n",i);
        (i == 0):printf(" i is equal to zero i=%d\n",i);
        }
    }
}
RESULTS

i is grater than zero i=69120
i is grater than zero i=475628600
i is grater than zero i=1129920902
i is grater than zero i=773000284
i is grater than zero i=1730349006
i is grater than zero i=1674352583
i is grater than zero i=1662201030
i is grater than zero i=2044158707
i is grater than zero i=1641506755
i is grater than zero i=797919327

EXAMPLE : forloop
program for_loop
{
    integer count, i;
    for(count = 0, i=0; i*count<50; i++, count++)
    printf("Value i = %0d\n", i);
}

RESULTS

Value i = 0
Value i = 1
Value i = 2
Value i = 3
Value i = 4
Value i = 5
Value i = 6
Value i = 7

EXAMPLE : whileloop
program while_loop{
    integer operator=0;
    while (operator<5){
        operator += 1;
        printf("Operator is %0d\n", operator);
    }
}
RESULTS

Operator is 1
Operator is 2
Operator is 3
Operator is 4
Operator is 5

EXAMPLE : dowhile
program test
{
    integer i = 0;
    do
    {
        printf("i = %0d \n", i);
        i++;
    } while (i < 10);
}
RESULTS

i = 0
i = 1
i = 2
i = 3
i = 4
i = 5
i = 6
i = 7
i = 8
i = 9

EXAMPLE : foeach
program example{
    string names[$]={"Hello", "Vera"};
    foreach (names, i) {
        printf("Value at index %0d is %0s\n", i, names[i]);
    }
}
RESULTS

Value at index 0 is Hello
Value at index 1 is Vera

EXAMPLE : randcase
program rand_case{
    integer i;
    repeat(10){
       randcase
       {
       10: i=1;
       20: i=2;
       50: i=3;
       }
    printf(" i is %d \n",i);}
}
RESULTS

i is 3
i is 2
i is 3
i is 3
i is 3
i is 3
i is 1
i is 1
i is 1
i is 2

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