Problem with "c" in functions

Question

Int sum (int, int)
Void main()
{
Int a=10,b=20,sum,c;
c=sum(a, b) ;
printf("%d", c) ;
}
Int sum(int x, int y);
{
return x+y;
}

Answer 1

Semi colon missing I'm first line, you are declaring a prototype, not a function, so semi colon is needed.
Second : v of void is capital, it should be small but void main won't work here, so you need to use int main.
Use return 0; after printf
Function declaration after main, semi colon will give an error as it's for prototype, so remove that.