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Question

for ( int i = 1; i < n ; i++){
int temp = arr[i];
int j;
for ( j = i-1 ; j >= 0 ; j-- ){
if ( arr[j] > temp){
arr[ j+1 ] = arr[j];
}
else {
break;
}
}
arr[j+1] = temp;
}
why can't we use
if ( arr[j] > arr[i] )
in place of
if ( arr[j] > temp )

Answer 1

Because in the second for loop, arr[i] can change its value (note that arr[j+1] is equal to arr[i] at the first iteration) . If arr[i] is changed then the second for loop wont work properly.