## 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;
}
}
```

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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```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;
}
}
```

Running the above

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

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