C program - Faulty scores output - c

Question

C program. IDE used is Xcode v12.2.
The problem I am facing:
Faulty scores output. For each round, the program should output the highest and lowest scores and the average score if the player chooses to do so.
Scores output after playing for 1 round:
Enter 'S' to show results
Enter 'P' to play another round
Enter 'R' to return to the main menu
S
Round 0 score: 92/100
Highest score: 92/100
Lowest score: 92/100
Average score:inf
****** Player: MAX ******
Scores output after playing for 2 rounds:
Enter 'S' to show results
Enter 'P' to play another round
Enter 'R' to return to the main menu
S
Round 0 score: 95/100
Highest score: 95/100
Lowest score: 92/100
Average score:inf
****** Player: MAX ******
Questions:
Why is 'Round 1' shown as 'Round 0'? And what does the 'inf' mean in the average score section? How do I turn 'inf' into a numerical output? After 2 rounds, the output 'Round 2' is still shown as 'Round 0' and the 'Average score' did not change to a numerical output.
What I have tried:
void quiz(char name[])
{
// function created to enclose quiz functionality apart from instructions
int rounds = 0;
int highest = 0;
int lowest = INT_MAX;
float allScore = 0;
float avg = 0;
int i, j, g = 0;
//char x;
struct struc test[MAX_TESTS];
srand((unsigned) time(NULL));
for (;;)
{
rounds++;
for (i = 0; i < MAX_TESTS; i++) // generate all questions
{
ctm_i(&test[i]);
for (j = 0; j < i; j++)
if (test[i].a == test[j].a && test[i].b == test[j].b && test[i].c == test[j].c)
//if question is already present
ctm_i(&test[i]); //then re-generate
}
//int ig = getchar();
char x;
x = getchar();
printf("\n Are you ready? Press Enter key to continue. ");
fflush(stdin);
while (x != '\n') {}
while (getchar() != '\n') {}
//getchar();
for (i = 1; i <= 5; i++)
{
printf( " *******************************************************************"
"**"
"***********\n");
printf( " ..................................................................."
".."
"...........\n");
}
// Take quiz
for (i = 0; i < MAX_TESTS; i++)
tcm_i(&test[i], i);
printf(" End\n\n");
bool done = false;
bool unsure = true;
bool showS = true;
while (unsure)
{
unsure = false;
puts("\n");
if (showS)
{
puts(" Enter 'S' to show results");
}
puts(" Enter 'P' to play another round");
//puts(" Enter 'Q' to quit");
puts(" Enter 'R' to return to main menu");
char choice;
printf(" ");
myread("%c", &choice);
if (choice == 'r' || choice == 'R')
{
done = true;
}
else if (choice == 'S' || choice == 's')
{
showS = false;
// calculate total score for current round
g = 0;
for (i = 0; i < MAX_TESTS; i++)
{
g += test[i].grade; //add score of each question
}
allScore += g; //add current round's score to total
avg = allScore / rounds; //average of all rounds
if (g > highest)
{
highest = g;
}
if (g < lowest)
{
lowest = g;
}
if (rounds == 1)
{
printf(" Final score: %d/100\n", g); //display round score
printf(" ******Player: %s ******\n", name);
}
else
{
//puts("Whoops! Looks like highest/lowest have not been adjusted!");
printf(" Round %d score: %d/100\n", rounds, g); //display round score
printf(" Highest score: %d/100\n", highest);
printf(" Lowest score: %d/100\n", lowest);
printf(" Average score: %f\n", avg);
printf(" ******Player: %s ******\n", name);
}
unsure = true;
//getchar();
}
else if (choice == 'P' || choice == 'p')
{
g = 0;
for (i = 0; i < MAX_TESTS; i++)
{
g += test[i].grade; //add score of each question
}
allScore += g; //add current round's score to total
if (g > highest)
{
highest = g;
}
if (g < lowest)
{
lowest = g;
}
}
else
{
puts(" Invalid input!");
unsure = true;
}
}
if (done)
break;
}
}

Answer 1

Why is 'Round 1' shown as 'Round 0'?
The value of variable rounds is printed as the round number. If the round number always prints as 0 then it follows that rounds always has value zero at the point where that printf() call is made. And indeed, a look at all the appearances of that variable in your code shows that it is initialized to zero in its declaration, and then never modified.
And what does the 'inf' mean in
the average score section?
It means "infinity", and before even looking at your code, I would take it as a sign that you have somewhere used the result of dividing a non-zero floating-point number by zero.
In particular, the problem seems to be the same one as the previous: you use rounds as the divisor in your average score computation, and it is always zero.
How do I turn 'inf' into a numerical
output?
Change the faulty computation into a correct one. Properly maintaining the value of the rounds variable may be enough.
After 2 rounds, the output 'Round 2' is still shown as 'Round
0' and the 'Average score' did not change to a numerical output.
That's consistent with my observations above.