sum+=year_sale[i]; }

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

cout<

//ex.5.7

#include #include using namespace std; struct car{

string name; int year; };

int main() {

cout<<\ int num;

(cin>>num).get(); car* ps=new car[num]; for(int i=0;i

cout<<\ cout<<\ getline(cin,ps[i].name);

cout<<\ (cin>>ps[i].year).get(); }

cout<<\ for(int i=0;i

cout<

//ex.5.8

#include

#include

int main() {

using namespace std;

char word[20]; int sum=0;

cout<<\ cin>>word;

while(strcmp(word,\ {

sum++; cin>>word; }

cout<<\ return 0; }

//ex.5.9

#include #include

int main() {

using namespace std; string word; int sum=0;

cout<<\ cin>>word;

while(word!=\ {

sum++; cin>>word; }

cout<<\ return 0; }

//ex.5.10

#include

int main() {

using namespace std;

cout<<\ }

int num; cin>>num;

for(int i=0;i

for(int j=num-i;j>1;j--) for(int k=0;k<=i;++k)

cout<

cout<<\

cout<<\

第六章 分支语句和逻辑运算符

//ex.6.1

#include #include

int main() {

using namespace std;

char ch; cin.get(ch);

while(ch!='@') {

if(isdigit(ch)) cin.get(ch); else {

if(islower(ch)) ch=toupper(ch); else

ch=tolower(ch); cout<

return 0;

}

//ex.6.2--数组

#include #include int main() {

using namespace std;

double sum=0,average=0; double num[10]; int i=0,total=0;

double temp;

while(cin>>temp&&i<10&&!isdigit(temp)) {

num[i]=temp; sum+=num[i]; ++i; }

if(i!=0) average=sum/i;

for(int j=0;javerage) ++total;

cout<<\这些数字的平均值为\ cout<<\并且共有\个数字大于平均值。\\n\

return 0; }

//ex.6.2--array

#include #include #include int main() {

using namespace std;