When you run a C++ program, what will appear on the screen after following statements:

int a[6]={2, 6, 3, 7, 1, 5}, t=0;
for(int i=0;i

Question

When you run  a C++ program, what will appear on the screen after following statements:

int a[6]={2, 6, 3, 7, 1, 5}, t=0;
for(int i=0;i<5;i++){
 	if (a[i+1]<a[i]){
		t=a[i];
		a[i]=a[i+1];
		a[i+1]=t;
		}
}
for (int k=0;k<6;k++)
cout<<a[k]<<” “;

The answer should be:  2    3    6    1    5    7
but how come

espex · Answer

Because as it is stepping through the program it evaluates the second position being less than the first. So in the third time through your index is 2 3 6 7 1 5 and when it evaluates position 4 being less than position 3 the condition is false and thus it does not move the value.

anonymous · Answer

the loop goes through each of the first 5 list items, one time and in order from left to right. It compares the item a[i] to the item immediately following it in the list a[i+1] and switches them if the one on the right is smaller.
2 6 3 7 1 5
look at the first(2)... larger than second(6)? no, do nothing
look at second(6)... larger than third(3)? yes, switch them
1 3 6 7 1 5
look at third(6)... larger than fourth(7)? no, do nothing
look at fourth(7)... larger than fifth(1)? yes, switch them
2 3 6 1 7 5
look at fifth(7)... larger than sixth(5)? yes, switch them
2 3 6 1 5 7
and we fall through the loop... print the results