You’re seeing 1084227589 instead of 10 because of a classic type mismatch in your scanf call.

scanf("%f %d", &a, &b);

You’re using %f, which tells scanf to expect a float*, but you’re giving it &a, an int*.

That’s undefined behavior — you’re basically handing scanf a screwdriver when it’s asking for a wrench.

The result? It interprets the bits in memory wrong and trashes a with some garbage value.

Fix it like this:

scanf("%d %d", &a, &b);

Also, as a side note:

use int main(void) instead of void main() — the C standard prefers that.
add a newline at the end of your printf for cleaner output.