（C）用户输入美金数量，换零钱的显示

#include//a is dollar amount, b is $20 bills, c is $10 bills, d is $5 bills, e is $1 bills.

int main()

{

int a,b,c,d,e;

scanf("%d",&a);

b=a/20;

c=(93-(b*20))/10;

d=(93-((b*20)+(c*10)))/5;

e=(93-((b*20)+(c*10)+(d*5)))/1;

printf("Enter a dollar amount: %d\n",a);

printf("$20 bills: %d\n",b);

printf("$10 bills: %d\n",c);

printf("$5 bills: %d\n",d);

printf("$1 bills: %d\n",e);

return 0;

}