floating point - Float value giving extremely large answer (C) -

i'm extremely new user of c++ , know why calculations producing extremely absurd results. part of code having problems with.

printf("please enter length of side:\n"); scanf("%.f", &lengthcube); volume=lengthcube*lengthcube*lengthcube; printf("the volume of cube %.f", volume); 

volume , lengthcube have been both defined float values. test value of 10 in gives answer of -13798...(a very long number). on issue appreciated. thanks!

you using wrong format scanf , printf - should "%f", not "%.f".