View Compilation Error

0_0_11137661_5158.c: In function `main':
0_0_11137661_5158.c:6: error: `s' undeclared (first use in this function)
0_0_11137661_5158.c:6: error: (Each undeclared identifier is reported only once
0_0_11137661_5158.c:6: error: for each function it appears in.)