Question

1) (5 points) The following program is used to display numbers between two intervals include stdio.h define true 1 define false 0 5 void prime (int low, int high) int i -o, flag-0 ; printf ("Prime numbers between %d and %d are: ", low, high); while (low <high) 10 flag false; 12 13 for (i 0; i <-low/2; ++i) - 15 16 17 if(low % ?--0) flagtrue: break; 19 20 21 if (flagtrue ) 23 24 25 26 27 28 29 30 31 int main) 32 printf ("%d ", 10) ; low printf ("\n"); int low, high; printf("Enter two numbers (intervals) scanf ("%d %d", low, high); 34 35 36 37 38 39 40 " prime.prime (low, high); return 0 Which line(s) is(are) incorrect? And how to correct it(them)? Please write down your correction for that line (those lines)

Answer 1

Line 35.

In Scanf the input variables should be prefixed with address operator (&) if not Seqment Violation error will occur. To correct it the Scanf should be written like below one

scanf("%d %d", &low,&high);

Line 11 and Line 17

Incorrect initialization. in line 11 flag should be initiazed with true and in 17 with false. Reason being when low value is divided by any number then the loop terminates with break statement by this time flag is true. Then only even number will be printed instead of prime numbers.

So line 11 flag = true;

line 17 flag = false;

Line 13. For loop control variable initilized with 0 so when low divided by i it will result in devide by zero error. So i should be initialized with 2.

for (i=2;i<low/2;i++){

}