# Is there an explanation for inline operators in “k += c += k += c;”? What is the explanation for the result from the following operation?

What is the explanation for the result from the following operation?

```k += c += k += c;
```

I was trying to understand the output result from the following code:

```int k = 10;
int c = 30;
k += c += k += c;
//c=70
```

and currently I am struggling with understanding why the result for "k" is 80. Why is assigning k=40 not working (actually Visual Studio tells me that that value is not being used elsewhere)?

Why is k 80 and not 110?

If I split the operation to:

```k+=c;
c+=k;
k+=c;
```

the result is k=110.

I was trying to look through the CIL, but I am not so profound in interpreting generated CIL and can not get a few details:

``` // [11 13 - 11 24]
IL_0001: ldc.i4.s     10
IL_0003: stloc.0      // k

// [12 13 - 12 24]
IL_0004: ldc.i4.s     30
IL_0006: stloc.1      // c
// [13 13 - 13 30]
IL_0007: ldloc.0      // k expect to be 10
IL_0008: ldloc.1      // c
IL_0009: ldloc.0      // k why do we need the second load?
IL_000a: ldloc.1      // c
IL_000b: add          // I expect it to be 40
IL_000c: dup          // What for?
IL_000d: stloc.0      // k - expected to be 40
IL_000f: dup          // I presume the "magic" happens here
IL_0010: stloc.1      // c = 70
IL_0012: stloc.0      // k = 80??????
```

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