src.cpp:7:14: error: two or more data types in declaration of 'tbc'
double float tbc,tong;
^
src.cpp:7:18: error: two or more data types in declaration of 'tong'
double float tbc,tong;
^
src.cpp: In function 'int main()':
src.cpp:17:5: error: 'tong' was not declared in this scope
tong = tong + a[i];}
^
src.cpp:19:5: error: 'tbc' was not declared in this scope
tbc = tong/n;
^
src.cpp:19:11: error: 'tong' was not declared in this scope
tbc = tong/n;
^