Addition of Float Values is incorrect - c

Question

Requirements for this task are as follows:
Read floating point values from stdin, each separated by a newline, and terminated by EOF.
The input values are in the range [-100,000 to +100,000].
The input will contain at least one floating-point value.
The input may contain blank lines: these should be ignored.
Apart from possible blank lines, the input is otherwise well-formed.
At EOF, output:
the smallest value seen
the largest value seen
the arithmetic mean of all the values seen
all accurate to two decimal places.
The output values must be separated by a single space character and followed by a newline character.
Examples:
Input:
7
5.6
6
Output:
5.60 7.00 6.20
Input:
11
Output:
11.00 11.00 11.00
In my code when I input 7, 5.6, and 6, my output is 5.60 7.00 5.77.
I know where the issue is but not sure how to fix it. My total variable says its value at EOF is 17.322826 which is definitely not correct.
#include <stdio.h>
int main() {
int i = 0;
float big = 0;
float small = 1000000;
float total;
float div = 0;
while (i == 0) {
float a = 0;
float flag = scanf("%f", &a);
if (flag == EOF) {
printf("%.2f %.2f %.2f %f %f\n", small, big, total / div, total, div);
break;
}
if (a > big) {
big = a;
}
if (a < small) {
small = a;
}
div++;
total = total + a;
}
return 0;
}

Answer 1

You forgot to initialize total to 0.
Further notes:
the classic C idiom for an infinite loop is for (;;) { ... }.
flag should be defined as an int
you should stop the loop when flag != 1 instead of just flag == EOF. An invalid input will cause the program to loop endlessly. You can actually drop this variable completely.
initializing big to 0 and small to 1000000 is incorrect: what if all values are negative? what if they are all very large?
Here is a corrected version:
#include <stdio.h>
int main(void) {
float a, big, small, total;
int div;
if (scanf("%f", &a) != 1)
return 1;
big = small = total = a;
div = 1;
while (scanf("%f", &a) == 1) {
if (big < a) {
big = a;
}
if (small > a) {
small = a;
}
div++;
total += a;
}
printf("%.2f %.2f %.2f\n", small, big, total / div);
return 0;
}