发布时间 : 星期六 文章C 面向对象程序设计教程[第3版]--陈维兴,林小茶课后习题答案解析更新完毕开始阅读afab04beec630b1c59eef8c75fbfc77da2699782
WORD格式.分享
} 7.10
#include
int main() {
for(int i = 1; i <= 7; i++) {
cout << setw(16-i);
for(int j = 1; j <= (2*i - 1); j++) {
cout << 'A'; }
cout << endl; }
return 0; } 7.11
#include
class matrix {
private:
int data[2][3]; public:
matrix(){}
friend ostream &operator<<(ostream &, matrix &); friend istream &operator>>(istream &, matrix &); friend matrix operator+(matrix &, matrix &);
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WORD格式.分享
};
ostream &operator<<(ostream &os, matrix &a) {
for(int i = 0; i < 2; i++) {
for(int j = 0; j < 3; j++) {
os << a.data[i][j] << \ \; }
os << endl; }
return os; }
istream &operator>>(istream &in, matrix &a) {
cout << \请输入一个2行3列矩阵：\ << endl; for(int i = 0; i < 2; i++) {
for(int j = 0; j < 3; j++) {
in >> a.data[i][j]; } }
return in; }
matrix operator+(matrix &a, matrix &b) {
matrix temp;
for(int i = 0; i < 2; i++) {
for(int j = 0; j < 3; j++) {
temp.data[i][j] = a.data[i][j] + b.data[i][j]; } }
return temp; }
int main() {
matrix m1, m2, total; cin >> m1 >> m2; total = m1 + m2;
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cout << total; return 0; } 7.12
#include
int main() {
fstream fout(\,ios::out); if(!fout) {
cout << \文件打开失败！\ << endl; return 1; }
fout << \;
fout << \; fout << \; fout.close(); return 0; } 7.13
#include
int main() {
char str[30];
fstream in(\, ios::in); if(!in) {
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WORD格式.分享
cout << \打开文件file1.txt错误！\\n\; abort(); }
in >> str >> str;
for(int i = 0; i < 30; i++) {
if(str[i] != 0 && (str[i] < 'A')) {
str[i] += ('A' - 'a'); } }
fstream out(\, ios::out); if(!out) {
cout << \打开文件file2.txt失败！\\n\; abort(); }
out >> str; in.close(); out.close(); return 0; } 7.14
#include
int main() {
char str[30];
fstream in(\, ios::in); if(!in) {
cout << \打开文件file1.txt错误！\\n\; abort(); }
in >> str >> str;
for(int i = 0; i < 30; i++) {
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