View Compilation Error

0_0_31656924_32535.cpp: In function 'int main()':
0_0_31656924_32535.cpp:6:5: error: 'flout' was not declared in this scope
     flout a,b;
     ^
0_0_31656924_32535.cpp:7:22: error: 'a' was not declared in this scope
     while(scanf("%f",a)!=EOF)
                      ^
0_0_31656924_32535.cpp:10:9: error: 'b' was not declared in this scope
         b=-a;
         ^
0_0_31656924_32535.cpp:12:9: error: 'b' was not declared in this scope
         b=a;
         ^
0_0_31656924_32535.cpp:13:23: error: 'b' was not declared in this scope
         printf("%.2f",b)
                       ^