View Compilation Error

241827_0_23622.c: In function `main':
241827_0_23622.c:5: error: `donble' undeclared (first use in this function)
241827_0_23622.c:5: error: (Each undeclared identifier is reported only once
241827_0_23622.c:5: error: for each function it appears in.)
241827_0_23622.c:5: error: syntax error before "c"
241827_0_23622.c:10: error: `c' undeclared (first use in this function)