1、system（pausereturn（0）;void instruct_purchase（void）printf（This program figure a total bill.The tax rate is $%.2f.n,tax_rate）;The discount of total purchase which is more than 100 dollars is $%.2f.n,discount_1）;The discount of total purchase which is less than 100 dollars is $%.2f.n,discount_2）;Please
2、 press or button after typing in each number.nnndouble total（double total_purchase,char a）double discount_total,total_payment,tax;if（a=t） if（total_purchase100） discount_total=total_purchase*discount_1; tax=total_purchase*tax_rate; total_payment=total_purchase+tax-discount_total; else discount_total=
3、total_purchase*discount_2;else tax=total_purchase*tax_rate; total_payment=total_purchase+tax;return（total_payment）;3.罗盘的度数换算为罗盘的方位。void direction（double angle_degree）;double angle_degree; printf（Please enter the angleof the total station. scanf（angle_degree）;The angle of the total station is %.2f?.n
4、nn,angle_degree）; direction（angle_degree）; system（ return（0）;void direction（double angle_degree）double angle; if （angle_degree=0） printf（The direction is east（E）.nnif（0angle_degree&angle_degree90）The direction is north（N） %.2f east（E）.nnif （angle_degree=90）The direction is north（N）.if（90180） angle=1
5、80-angle_degree;The direction is north（N） %.2f west（W）.nn,angle）;if（angle_degree=180）The direction is west（W）.nnif（180270） angle=angle_degree-180;The direction is south（S） %.2f west（W）.nnif（angle_degree=270）The direction is south（S）.nnif（270fa）;color（fa）;void color（char fa）switch（fa）case O: case oTh
6、e color suggest the content is ammonia gas.nn break;case BbThe color suggest the content is CO.nnYyThe color suggest the content is hydrogen.nnGgThe color suggest the content is oxygen.nndefault:There is not the container.5对地震的理氏数进行描述。void Richter_scale（double a）;double a;Please enter the Richter sc
7、ale of the earthquake.Richter_scale（a）;void Richter_scale（double a） if（a0&a5.0）破?坏很小?或者?没?有D.nelse if（a=7.5）大部?分被There is not this magnititude of earthquake.n（2）switch函数编写char Richter_scale（double a）;void sf（char b）;char b;b=Richter_scale（a）;sf（b）;char Richter_scale（double a） char c;if（a c=A; return
8、（c）; CDE=0）Fvoid sf（char b）switch（b）D。break;。屋Y和无T该?地震e等级?6.判断一个点在哪个象限void quadrant（double a,double b）;double a,b;Please enter the coordinate of the dot.%lf %lfa,&b）;quadrant（a,b）;void quadrant（double a,double b）if（a=0&b!（%.2f,%.2f） is on the y axis.n,a,b）;if（a!=0&b=0）（%.2f,%.2f） is on the x axis.nb
9、0）（%.2f,%.2f） is in quadrant.nb（%.2f,%.2f） is in the quadrant .nif（a%d %d %dyear,&month,&day）;e=leap（year）;order（year,month,day,e）;int leap（int year）int a,b,c,d;a=year%4;b=year%100;c=year%400; if（a=0&b=0）|c=0） d=1; d=0;return（d）;void order（int year,int month,int day,int e）int dayth;if（e=1） if（month=
10、1） dayth=day;This day is the %d day of %d year.n,dayth,year）; if（month=2） dayth=31+day; if（month=3） dayth=31+29+day; if（month=4） dayth=31+29+31+day; if（month=5） dayth=31+29+31+30+day; if（month=6） dayth=31+29+31+30+31+day; if（month=7） dayth=31+29+31+30+31+30+day; if（month=8） dayth=31+29+31+30+31+30+3
11、1+day; if（month=9） dayth=31+29+31+30+31+30+31+31+day; if（month=10） dayth=31+29+31+30+31+30+31+31+30+day; if（month=11） dayth=31+29+31+30+31+30+31+31+30+31+day; if（month=12） dayth=31+29+31+30+31+30+31+31+30+31+30+day; dayth=31+28+day; dayth=31+28+31+day; dayth=31+28+31+30+day; dayth=31+28+31+30+31+day
12、; dayth=31+28+31+30+31+30+day; dayth=31+28+31+30+31+30+31+day; dayth=31+28+31+30+31+30+31+31+day; dayth=31+28+31+30+31+30+31+31+30+day; dayth=31+28+31+30+31+30+31+31+30+31+day; dayth=31+28+31+30+31+30+31+31+30+31+30+day;9.居民用电#define R_price 0.052#define C_price 0.045#define I_price_P 0.065#define I
13、_price_NP 0.028void type_consumption（char type,double e_consumption）;void R_consumption（double e_consumption）;void C_consumption（double e_consumption）;void I_consumption（double e_consumption）;double e_consumption; char type;The alphabet R means reside,C means commercial,I means industry.Please enter the application type （R,C or I）.type）;Please enter the consumption of electricity.e_consumption）;type_consumption（type,e_consumption）;return 0;void type_consumption（char type,double e_consumption）if（type=RR_consumption（e_consumption）;else if （type=C_consumption（e_c
