Main.cc: In function ‘int main()’: Main.cc:17:1: error: ‘retun’ was not declared in this scope retun 0; ^~~~~ Main.cc:17:1: note: suggested alternative: ‘rewind’ retun 0; ^~~~~ rewind Main.cc:5:13: warning: unused variable ‘k’ [-Wunused-variable] int n,i,j=0,k=0, a[100], b[100];//a[100]用来存放奇数,b[100]用来存放偶数 ^ Main.cc:5:18: warning: unused variable ‘a’ [-Wunused-variable] int n,i,j=0,k=0, a[100], b[100];//a[100]用来存放奇数,b[100]用来存放偶数 ^