View Compilation Error

0_0_6958655_21361.c:2: error: syntax error before '{' token
0_0_6958655_21361.c:10: error: syntax error before "for"
0_0_6958655_21361.c:13: error: redefinition of 'sum'
0_0_6958655_21361.c:9: error: previous definition of 'sum' was here
0_0_6958655_21361.c:13: error: `a' undeclared here (not in a function)
0_0_6958655_21361.c:14: error: syntax error before '}' token