Why is it important to put the value of zero when declaring a variable and in c++, whats the purpose of return 0?

Answer 1

Wow! Thanks sir for your answer. Now i understand :D

Answer 2

it is not much important to declare a variable as zero
when u are using it like
int d;
d=k; where k is some another number in your code
here no need to declare it as zero
or when u r using like
int d=0;
d=d+k; here u need to declare it as 0 in the starting or else it may assign an random value itself which gives u an error in the output
finally i suggest u to declare a value as zero so that most of the times no error is printed
in the same way we use return 0; at the end of the code