/in/foo.c: In function 'main':
/in/foo.c:6:10: warning: format '%f' expects argument of type 'float *', but argument 2 has type 'int *' [-Wformat=]
  scanf("%f",&f);
          ^
/in/foo.c:9:20: warning: format '%f' expects argument of type 'double', but argument 2 has type 'int' [-Wformat=]
        printf("c%.2f\n",c);
                    ^