Data type interview questions

1. What is use of void data type?
2. What is size of int data type in c?
3. What will happen if we will assign a value to float variable which is beyond the range of float data type?
4. Write down three derived data types in c.
5. Can we use signed keyword with double? Why?  
6. Why range of signed char is -128 to 127 not -127 to 128?
7. What is cyclic nature of int data type?
8. What will be output of following c code?
void main(){
    char i=250;
9. What is volatile keyword in c?
10. It is necessary to initialize the const variable in c?
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