View Compilation Error

0_0_5985775_12432.c: In function `sum':
0_0_5985775_12432.c:34: error: `arr' undeclared (first use in this function)
0_0_5985775_12432.c:34: error: (Each undeclared identifier is reported only once
0_0_5985775_12432.c:34: error: for each function it appears in.)
0_0_5985775_12432.c:34: error: syntax error at end of input