For loop in a function brings up random numbers

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So I'm writing a program about finding the sum number of all ranges for instance, if I enter a 1 and then a 10 it should display 55, but instead it display some long random number. Does anyone have a clue what's wrong with this code? Thanks!

#define <stdio.h>

calculateSum(int lowNumber, int highNumber);

int main()
{
   int lowerNumber,
       higherNumber;

   scanf("%d", lowerNumber);
   scanf("%d", higherNumber);

   printf("The sum of all ranges is: %d", calculateSum(lowerNumber, higherNumber));

int calculateSum(int lowNumber, int highNumber)
{
    int total;

    for(int x = lowNumber; x <= highNumber; x++)
    {
       total = total + x;
    }
    return total;
}

You're not initializing total before its first use as a rvalue (which is the RHS of assignment total = total + x;) thus its value remains undefined (and indeterminate.)

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In addition to @biplls answer there is also another issue:

int lowerNumber,
   higherNumber;

scanf("%d", lowerNumber);
scanf("%d", higherNumber);

is UB (produces a warning on compilation and a SEGFAULT during runtime). printf expects an int*, not int. The correct code would be

int lowerNumber,
   higherNumber;

scanf("%d", &lowerNumber);
scanf("%d", &higherNumber);

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A few errors here

  1. it's #include <stdio.h> not #define
  2. When using scanf you have to add an & before the var you read into (in this case!! )
  3. The main fn doesn't return anything, it should be returning 0 (normally) (apparently I'm wrong on this , main returns 0 implicitly from C99)
  4. Main fn isn't closed before you write the next fn
  5. total should be set to 0
  6. for loop initialization is allowed only in C99
  7. It is a good idea to declare the return type of the prototype

fixing all this

#include <stdio.h>

int calculateSum(int lowNumber, int highNumber);

int main()
{
   int lowerNumber,
       higherNumber;

   scanf("%d", &lowerNumber);
   scanf("%d", &higherNumber);

   printf("The sum of all ranges is: %d\n", calculateSum(lowerNumber, higherNumber));
   return 0;
}

int calculateSum(int lowNumber, int highNumber)
{
    int total;
    total = 0;

    for(int x = lowNumber; x <= highNumber; x++)
    {
       total = total + x;
    }
    return total;
}

Running the above

$ ./sum
1
10
The sum of all ranges is: 55

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