View Compilation Error

0_0_6548882_15010.c: In function `main':
0_0_6548882_15010.c:17: error: syntax error before '/' token
0_0_6548882_15010.c:22: error: `sum' undeclared (first use in this function)
0_0_6548882_15010.c:22: error: (Each undeclared identifier is reported only once
0_0_6548882_15010.c:22: error: for each function it appears in.)
0_0_6548882_15010.c:23: error: 'for' loop initial declaration used outside C99 mode
0_0_6548882_15010.c:26: error: `res' undeclared (first use in this function)
0_0_6548882_15010.c:29: error: `from' undeclared (first use in this function)
0_0_6548882_15010.c:30: error: `to' undeclared (first use in this function)