cprimerplus第六版课后编程练习答案

constintseconds_per_minute=60;

intmain()

{

usingnamespacestd;

cout<<\

longseconds;

cin>>seconds;

intDay,Hour,Minute,Second;

Day=seconds/seconds_per_minute/minutes_per_hour/hours_per_day;

Hour=seconds/seconds_per_minute/minutes_per_hour%hours_per_day;

Minute=seconds/seconds_per_minute%minutes_per_hour;

Second=seconds%seconds_per_minute;

cout<

\

return0;

}

//ex3.5

#include

intmain()

{

usingnamespacestd;

cout<<\

longlongworld_population;

cin>>world_population;

cout<<\

longlongUS_population;

cin>>US_population;

doublepercentage;

percentage=(double)US_population/world_population*100;

cout<<\

return0;

}

//ex3.6?汽车耗油量-美国(mpg)or欧洲风格(L/100Km)

#include

intmain()

{

?usingnamespacestd;

?cout<<\

?doublem_distance;

?cin>>m_distance;

?cout<<\

?doublem_gasoline;

?cin>>m_gasoline;

?cout<<\

?cout<<\

?cout<<\

?doublek_distance;

?cin>>k_distance;

?cout<<\

?doublek_gasoline;

?cin>>k_gasoline;

?cout<<\petrolper100kilometers\\n\

?return0;

}

//ex3.7automobilegasolineconsumption-耗油量--欧洲风格(L/100Km)转换成美国风格(mpg)

#include

intmain()

{

usingnamespacestd;

cout<<\

<<\

doubleEuro_style;

cin>>Euro_style;