C programming find min,max and sum without using recursion and arrays - c

Question

I am trying to write a program that get bunch of numbers, n >= 5
The program asks from the user to enter n non-negative numbers and calculate min,max and the sum of the numbers.
In case the user enter negative numbers, the function asks to enter a positive number.
I have a problem with the first negative number, any clue what's wrong with the following code?
void main()
{
int x;
printf("Enter number:\n");
scanf("%d", &x);
if (x >= 5)
{
int max = 0, min, num1;
printf("Enter numbers: \n");
scanf("%d", &num1); //here was the error
min = num1;
int sum = num1;
for (int i = 1; i < x; i++)
{
scanf("%d", &num1);
while (num1 < 0)
{
{
printf("Enter again number: /n");
scanf("%d", &num1);
}
}
if (num1 > max)
max = num1;
else if (num1 < min)
min = num1;
sum += num1;
}
printf("The max number is %d, and the min is %d, and the sum is %d", max, min, sum);
}
else
printf("invalid number!");
}
output:
Enter number:
8
Enter numbers:
-8
7
6
9
10
6
7
6
The max number is 10, and the min is -8, and the sum is 43

Answer 1

check if min<0 assign new entered value of num1 to it.
for (int i = 1; i < x; i++)
{
scanf("%d", &num1);
if (min < 0)
min = num1;
while (num1 < 0){
//rest of the code}
}

Answer 2

I have a problem with the first negative number, any clue what's wrong with the following code?
Do not read first number with special code, which lacks a negative test. Simplify and read just like other numbers.
Simply start min,max with extremes.
#include <limits.h>
...
int max = INT_MIN;
int min = INT_MAX;
int sum = 0;
printf("Enter numbers: \n");
for (int i = 0; i < x; i++) { // start at 0
int num1;
scanf("%d", &num1);
while (num1 < 0) {
printf("Enter again number: /n");
scanf("%d", &num1);
}
if (num1 > max)
max = num1;
// else if (num1 < min)
if (num1 < min)
min = num1;
sum += num1;
}
printf("The max number is %d, and the min is %d, and the sum is %d",
max, min, sum);

Answer 3

you should put while after taking the input from the user to prevent any negative number also inside while there isn't need to put double cure prates
#include <stdio.h>
int main()
{
int x;
printf("Enter number:\n");
scanf("%d", &x);
if (x >= 5)
{
int max = 0, min, num1,sum;
printf("Enter numbers:\n");
sum = 0;
min = num1;
for (int i = 1; i<=x; i++)
{
scanf("%d",&num1);
while(num1<0)
{
printf("Enter again number: \n ");
scanf("%d", &num1);
}
if (num1 > max)
{ max = num1;}
if (num1<min)
{ min = num1;}
sum += num1;
}
printf("The max number is %d, and the min is %d, and the sum is %d", max, min, sum);
}
else
printf("invalid number!");
return 0;
}
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