View Compilation Error

0_0_7125041_16693.c: In function `sum':
0_0_7125041_16693.c:6: error: `res' undeclared (first use in this function)
0_0_7125041_16693.c:6: error: (Each undeclared identifier is reported only once
0_0_7125041_16693.c:6: error: for each function it appears in.)
0_0_7125041_16693.c: In function `solue':
0_0_7125041_16693.c:17: error: syntax error before ')' token
0_0_7125041_16693.c: In function `main':
0_0_7125041_16693.c:27: error: syntax error before '}' token