View Compilation Error

101135_0_32019.c: In function `main':
101135_0_32019.c:15: error: syntax error before ')' token
101135_0_32019.c:20: error: `s' undeclared (first use in this function)
101135_0_32019.c:20: error: (Each undeclared identifier is reported only once
101135_0_32019.c:20: error: for each function it appears in.)
101135_0_32019.c:20: error: `i' undeclared (first use in this function)
101135_0_32019.c: At top level:
101135_0_32019.c:24: error: syntax error before "return"