View Compilation Error

0_0_13002769_16395.c: In function `per':
0_0_13002769_16395.c:14: error: syntax error before '/' token
0_0_13002769_16395.c: At top level:
0_0_13002769_16395.c:19: error: syntax error before '+' token
0_0_13002769_16395.c:19: error: conflicting types for 'per'
0_0_13002769_16395.c:12: error: previous definition of 'per' was here