李爱华、程磊_面向对象程序设计课后答案

第二章

2-4

#include

using namespace std;

Add(int a,int b); int main() {

int x,y,sum;

cout<<\cin>>x>>y; sum = add(x,y);

cout <

Add(int a,int b) {

return a+b; }

2-5

(1)this is a C++ program. (2)

x=50.6 y=10 z=A x=216.34 y=10 z=A x=216.34 y=2 z=A x=216.34 y=2 z=E (3) x y z 500 1000 0 500 1500 1500 500 200 1500 2-6

#include using namespace std; int main() {

int *p,*init; int countp=0; int countn=0; p = new int[20]; init = p;

for(int i=0;i<20;i++) { cin>>*p; p++; }

p = p-20;

for( i=0;i<20;i++) {

if(*p>0) countp++; if(*p<0) countn++; cout<<*p<<\ p++; }

cout<<\正数有:\

cout<<\负数有:\ p = init;

delete[] p; return 0;}

2-7不做要求

#include //#include using namespace std;

void checkagescore(string name,int age) {

if (name == \

if(age<0||age>50) throw age;

} int main() {

string name; int age;

for(int i=0 ;i<5 ;i++ ) {

cin.ignore (); getline(cin,name );

cin>>age ; try {

checkagescore(name,age); }

catch( string) {