ERROR: do not initialise globals to 0
WARNING: line length of 105 exceeds 80 columns
WARNING: line length of 120 exceeds 80 columns
WARNING: line length of 83 exceeds 80 columns
WARNING: line length of 86 exceeds 80 columns
WARNING: line length of 87 exceeds 80 columns
WARNING: line length of 94 exceeds 80 columns
WARNING: line length of 96 exceeds 80 columns
WARNING: line length of 97 exceeds 80 columns
WARNING: line length of 98 exceeds 80 columns