C++大学教程习题解答（第七版） 

第六章 函数和递归入门

6.12

#include #include #include using namespace std;

double calculateCharges( double hours );

int main( ) {

cout << \; cin >> hours1 >> hours2 >> hours3; cout << fixed << setprecision( 2 );

cout << \ << setw( 20 ) << \ << setw( 20 ) << \<< endl; cout << \ << setw( 20 ) << hours1<< setw( 20 ) << calculateCharges( hours1 )<

<< calculateCharges( hours1 ) + calculateCharges( hours2 ) + double hours1, hours2, hours3;

calculateCharges( hours3 ) <

double calculateCharges( double hours ) { }

if( ( hours >0 ) && ( hours <= 3 ) )

return 2.0; else

if( ( hours>3 )&& ( hours <= 19 ) )

return 2.00+ceil( hours - 3 )*0.5; return 10; else

6.14

#include #include #include using namespace std;

double roundToInteger( double ); double roundToTenths( double );

double roundToHundredths( double ); double roundToThousandths( double );

int main( ) { }

double roundToInteger( double number ) { }

double roundToTenths( double number ) { }

double roundToHundredths( double number ) }

double roundToThousandths( double number ) }

{

return floor( number*1000 + .5 ) / 1000; {

return floor( number*100 + .5 ) / 100; return floor( number*10 + .5 ) / 10; return floor( number + .5 ) ;

cout << \ << roundToInteger( x ) <

cout << \ << roundToHundredths( x ) <> x; double x;

6.16

#include #include #include #include using namespace std;

int main( ) { }

x= -3 + rand( ) % 15; cout<<\<< x <

x= 0 + rand( ) % 9; cout<<\<< x <

x= 1 + rand( ) % 1; cout<<\<< x <

6.17

#include #include #include #include using namespace std;

int main() {

int array1[] = { 2, 4, 6, 8, 10 }; int array2[] = { 3, 5, 7, 9, 11 }; int array3[] = { 6, 10, 14, 18, 22 }; srand( time( 0 ) );

for (int i = 0; i < 3; i++) {

cout<< \第ì¨2\ <

cout<<\第ì¨2一°?组á¨|数oy据Y中D的ì?随?机¨2数oy:\<

}

return(0); }

6.18

#include using namespace std;

int integerPower( int, int );

int main() { }

int integerPower( int base, int exponent ) { }

int value1 = 1;

for( int counter = 1;counter <= exponent ; counter++ )

value1 *= base; return value1;

cout << \ << x << \ << y << \ <

cout << \; cin >> x;

cout << \; cin >> y;

6.19

#include #include #include using namespace std;

double hypotenuse( double, double );

int main() {

double x,y;

cout << \; cin >> x;

cout << \;

}

cin >> y;

cout << \ << fixed << setprecision(2)<

double hypotenuse( double side1, double side2 ) { }

return sqrt( pow( side1 ,2 ) + pow( side2 ,2 ) );

6.20

#include #include using namespace std;

bool multiple( double, double );

int main( ) {

cout<

cout << \ cout << \

// if( multiple( x,y )==1 ) // // }

bool multiple( double number1, double number2 ) { }

if( ceil( number2 / number1 ) == floor( number2 / number1 ))

return true; return false; else // else

goto loop;

cout<<\;

cin >> x >> y;

loop:

int x,y;

6.21

#include #include using namespace std;