Trying to code this (from a C tutorial), don't know why output is unexpected.

[ebon laurel]

Tried to write this three different ways (this one happens to use modulus remainder) why are the 2nd set of ternaries resulting in unexpected output?

#include <stdio.h>

int main() {
    int input1, input2, input3;
    
    printf("Input three integers:");
    scanf("%d", &input1);
    scanf("%d", &input2);
    scanf("%d", &input3);

    int sumEven;
    int sumOdd;

    sumOdd += input1 % 2 == 1 ? input1:0;
    sumOdd += input2 % 2 == 1 ? input2:0;
    sumOdd += input3 % 2 == 1? input3:0;

    sumEven += (input1 % 2 == 0) ? input1:0;
    sumEven += (input2 % 2 == 0) ? input2:0;
    sumEven += (input3 % 2 == 0) ? input3:0;

    printf("Sum of even numbers: %d\n", sumEven);
    printf("Sum of odd numbers: %d", sumOdd);

    return 0;
}

Input: 1 2 3

Expected output:
Even: 2
Odd : 4

Actual output:
Even: 18
Odd: 4

Thanks

[drowsy venture]

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[ebon laurel]

compiler is MinGW

Context: code is meant to grab three inputs, and output sum of even and sum of odd numbers.

[vivid light]

You need to initialize your variables sumEven and sumOdd, probably you want to initialize them to 0 as the default value.
If you don't do that then the variables value is garbage and accessing it is UB (undefined behaviour).

[ebon laurel]

OH

c Doesn't have default values? I thought you only needed to initialize constants

[vivid light]

C has some default values, but not like this for local variables

[ebon laurel]

Ah I see, thank you.

[drowsy venture]

Thank you and let us know if you have any more questions!

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