while statement implementation of sentinel loop:

int score;
int sentinel = -1;

printf("Enter first score>");
scanf("%d", &score);
while (score != sentinel)
{
	process(score);    /* call function process */
	printf("Enter next score>");
	scanf("%d", &score);
}


Loop control variable is an input variable (score in this 
case). The data entry for score comes before the while loop 
and at the very bottom of the while loop.

In your problem, there are 3 input variables: id, hours, rate 
where id is the first of the 3. Which should be the loop 
control variable? ____ id - first data item read for each person

Where should you put the statements that read in the values 
of the other two input variables? ____ at the beginning of the loop

By the way -- make sure you call a function to compute 
gross pay and net pay as specified in the problem 
statement. The function definitions should come after the 
main function.




Write a loop that reads a series of numbers and calculates 
their product. Display the final product. The calculation 
should stop when the number 0 is read. (counting or 
sentinel?)   sentinel


double product;
double num;
double sentinel = 0;

product  = _____;        1
printf("Enter a number to multiply or 0:");
scanf(            );             &num
while (                         )   num != sentinel  
{
      _______ = _______ * ________;      product *= num
      
      printf("Enter a number to multiply or 0:");
      scanf(                                );      &num
}

Write a loop that reads a series of numbers and calculates 
their product. Display the final product. The calculation 
should stop when the number 0 is read. Also display the 
count of numbers mulitplied (counting loop or sentinel?)   sentinel but 
counter is used as a program variable



double product;
double num;
double sentinel = 0;
int count;

count = _____;   0
product  = _____;
printf("Enter a number to multiply or 0:");
scanf(            );    &num
while (                                )    num != sentinel
{
      _______ = _______ * ________;   product *= num;
      count _____________________;    count++;

      printf("Enter a number to multiply or 0:");
      scanf(                                );     &num
}

printf("Number of items multiplied is %d\n", count);





Write a loop that reads up to 10 numbers and calculates 
their product. Display the final product and the number of 
items read. The calculation should stop when the 10th 
number is read or the number 0 is read. (counting or 
sentinel?)        sort of a combination - hybrid

double product;
double num;
double sentinel = 0;
int count;
int MaxItems = 10;

printf("Enter a number to multiply or 0:");
scanf(            );      &num
______ = ______;          count = 0;   product = 1;
while ( num != sentinel   &&  count < MaxItems )
{
           _______ = _____ *  ______;   product *= num;
           ______________;                count++;
   printf("Enter a number to multiply or 0:");
           scanf(            );           &num
}

printf("Number of items multiplied is %d\n", count);