0_0_17621045_12993.c: In function 'main': 0_0_17621045_12993.c:31:9: error: 'b' undeclared (first use in this function) if(b[j]>b[i]) ^ 0_0_17621045_12993.c:31:9: note: each undeclared identifier is reported only once for each function it appears in