/in/foo.c: In function 'main':
/in/foo.c:8:20: warning: format '%f' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
        printf("c%.2f\n",c);
                    ^
/in/foo.c:6:9: warning: 'f' is used uninitialized in this function [-Wuninitialized]
  if(f>=0&&f<=1000)
     ~~~~^~~~~~~~~