View Compilation Error

887091_0_0_7152.c: In function `main':
887091_0_0_7152.c:23: error: `retu' undeclared (first use in this function)
887091_0_0_7152.c:23: error: (Each undeclared identifier is reported only once
887091_0_0_7152.c:23: error: for each function it appears in.)
887091_0_0_7152.c:23: error: syntax error at end of input