View Compilation Error

0_0_3352970_8546.c: In function `sum':
0_0_3352970_8546.c:4: error: 'a' redeclared as different kind of symbol
0_0_3352970_8546.c:3: error: previous definition of 'a' was here
0_0_3352970_8546.c:4: error: 'b' redeclared as different kind of symbol
0_0_3352970_8546.c:3: error: previous definition of 'b' was here
0_0_3352970_8546.c:8: error: stray '`' in program