Please explain this 🙏

Question

#include <iostream>
using namespace std;

int main() {
int a[3]={2,7,3};
for (int i=0;i<3;i++){
a[i]-=i;
}
cout <<a[1];
return 0;
}

Answer 1

Can you please explain a[1]=a[1]-1

Answer 2

a[1] equals to 7. a[1]=a[1]-1 is the same as a[1]=7-1.
7-1 equals to 6. That means, that a[1] is getting the value 6.

Answer 3

answer is 6

EXPLANATION:

First we made an array and gave values to it. Now using for loop we change the values stored in the array. As a[i]-=i is equivalent to a[i] = a[i] - i. So when i =1, its a[1]=a[1]-1 ( a[1]=7-1) which comes out to be 6.

hope this helped!!

Answer 4

its normal algebra.
like if x =7 and we write x = x - 1. similarly a[1] is 7 and we are changing its value by that algebraic expression.

did this help?