The precision of float floating point number can be guaranteed within 6 decimal places, so your problem is not the precision of float, because you don't know what your wrong result is and you can't guess it.

The following is a program that uses arrays and loops, which saves code and adds two kinds of security processing: double precision and security operation (this also applies to your program, you can modify it).

# include & ltstdio.h & gt

# include & ltstdlib.h & gt

int？ Master ()

{

Double? x； //Double precision

int？ Y, me;

int？ a[ 13]={ 10000，5000，2000， 1000，50，20， 10，5，2， 1 }；

int？ b[ 13]；

scanf("%lf "，& ampx)；

x=？ x * 100.0；

y =(int)x； //Safety calculation

For what? (I = 0； I< 13; i++)

{

b[i]？ =? y/a[I]；

y？ =? y % a[I]； //y？ -? a[i]*b[i]

}

For what? (I = 0； I< 13; i++)

{

if(b[i]==0)？ Continue;

if(a[I]& lt； 10)// min

printf("%d？ Finn:? %d\n "，a[i]，b[I])；

Or what? if(a[I]& lt； 100)// coke

printf("%d？ Jiao:? %d\n "，a[i]/ 10，b[I])；

Or what? //yuan

printf("%d？ Yuan:? %d\n "，a[i]/ 100，b[I])；

}

System ("suspended");

Return? 0;

}