a. double num1, int num2 =0;
b. int num1,num2;
c. int num1, num2 = 0;
d. int num1 = 0, num2 = 0;
Answer:
a. double num1, int num2 = 0;
Explanation
After declaring a variable or a group of variables of same data type semi-colon should be placed. In the above option a. after declaring num1 as double a semi-colon should be placed, then that declaration would compile correctly.