What is the type of software bug and how do fix the issue in the code segment?

Code Fragment #2

const int val = 5;

int x=0;

while (x < 5)

cout <<"Value of x is " << x++ << endl;

return 0;

Code Fragment #3

const int x[5] = {1 , 2, 3, 4, 5};

for (int i=1; i<6; i++)

cout <<"Value of x[ "<< i << "] = " << x[i] << endl;

return 0;