5.3
#include<iostream>
int main() {
int val = 1,sum=0;
while (val <= 10) {
sum += val;
++val;
}
std::cout << sum;
}
5.5
#include<iostream>
#include<string>
#include<vector>
using namespace std;
int main() {
const vector<string> scores = { "F","D","C","B","A","A++" };
int grade = 0;
while (cin >> grade) {
if (grade == 100) {
cout << scores[5] << endl;
}
else {
if (grade >= 90) {
cout << scores[4] << endl;
}
else {
if (grade >= 80) {
cout << scores[3] << endl;
}
else {
if (grade >= 70) {
cout << scores[2] << endl;
}
else {
if (grade >= 60) {
cout << scores[1] << endl;
}
else {
cout << scores[0] << endl;
}
}
}
}
}
}
}
5.6
#include<iostream>
#include<string>
#include<vector>
using namespace std;
int main() {
int grade;
cin >> grade;
cout << ((grade == 100) ? ("A++") : (grade >= 90) ? ("A") : (grade >= 80) ? ("B") : (grade >= 70) ? ("C") : (grade >= 60) ? ("D") : ("F"));
}
5.7
#include<iostream>
#include<string>
#include<vector>
using namespace std;
int main() {
int ival = 0;
if (cin >> ival) {
cout << ival << endl;
if (!ival) {
cout << "ival=0" << endl;
}
}
}
5.9
#include<iostream>
#include<string>
#include<vector>
using namespace std;
int main() {
string text = "";
cin >> text;
int aCnt = 0, eCnt = 0, iCnt = 0, oCnt = 0, uCnt = 0;
for (auto q : text) {
if (q == 'a') {
++aCnt;
}
else {
if (q == 'e') {
++eCnt;
}
else {
if (q == 'i') {
++iCnt;
}
else {
if (q == 'o') {
++oCnt;
}
else {
if (q == 'u') {
++uCnt;
}
}
}
}
}
}cout << "文档中存在 a " << aCnt << "个" << endl;
cout << "文档中存在 e " << eCnt << "个" << endl;
cout << "文档中存在 i " << iCnt << "个" << endl;
cout << "文档中存在 o " << oCnt << "个" << endl;
cout << "文档中存在 u " << uCnt << "个" << endl;
}
5.10
#include<iostream>
#include<string>
using namespace std;
int main() {
string text = "";
char ch;
int aCnt = 0, eCnt = 0, iCnt = 0, oCnt = 0, uCnt = 0;
while(cin>>ch){
switch (ch) {
case 'a':
case'A':
++aCnt;
break;
case'e':
case'E':
++eCnt;
break;
case'i':
case'I':
++iCnt;
break;
case 'o':
case'O':
++oCnt;
break;
case'u':
case'U':
++uCnt;
break;
}
}cout << "Number of vowel a " << aCnt<<endl;
cout << "Number of vowel e " << eCnt<<endl;
cout << "Number of vowel i " << iCnt<<endl;
cout << "Number of vowel o " << oCnt<<endl;
cout << "Number of vowel u " << uCnt<<endl;
}
5.11
#include<iostream>
#include<string>
using namespace std;
int main() {
string text = "";
char ch;
int aCnt = 0, eCnt = 0, iCnt = 0, oCnt = 0, uCnt = 0,space_Cnt=0,nCnt=0,tCnt=0;
while (cin >> std::noskipws>> ch) {
switch (ch) {
case 'a':
case'A':
++aCnt;
break;
case'e':
case'E':
++eCnt;
break;
case'i':
case'I':
++iCnt;
break;
case 'o':
case'O':
++oCnt;
break;
case'u':
case'U':
++uCnt;
break;
case' ':
++space_Cnt;
break;
case'\n':
++nCnt;
break;
case'\t':
++tCnt;
break;
}
}cout << "元音 a(A)数量为 " << aCnt << endl;
cout << "元音 e(E)数量为 " << eCnt << endl;
cout << "元音 i(I)数量为 " << iCnt << endl;
cout << "元音 o(O)数量为 " << oCnt << endl;
cout << "元音 u(U)数量为 " << uCnt << endl;
cout << "空格数量为 " << space_Cnt << endl;
cout << "回车符数量为 " << nCnt << endl;
cout << "制表符数量为 " << tCnt << endl;
}
5.12
#include<iostream>
#include<string>
using namespace std;
int main() {
string text = "";
char ch,prech='\0';
int aCnt = 0, eCnt = 0, iCnt = 0, oCnt = 0, uCnt = 0, space_Cnt = 0, nCnt = 0, tCnt = 0;
int ffCnt = 0, flCnt = 0, fiCnt = 0;
while (cin >> std::noskipws >> ch) {
switch (ch) {
case 'a':
case'A':
++aCnt;
break;
case'e':
case'E':
++eCnt;
break;
case'i':
if (prech == 'f') {
++fiCnt;
}
++iCnt;
break;
case'I':
++iCnt;
break;
case 'o':
case'O':
++oCnt;
break;
case'u':
case'U':
++uCnt;
break;
case' ':
++space_Cnt;
break;
case'\n':
++nCnt;
break;
case'\t':
++tCnt;
break;
case'f':
if (prech == 'f') {
++ffCnt;
}
break;
case'l':
if (prech == 'f') {
++flCnt;
}
break;
}prech = ch;
}cout << "元音 a(A)数量为 " << aCnt << endl;
cout << "元音 e(E)数量为 " << eCnt << endl;
cout << "元音 i(I)数量为 " << iCnt << endl;
cout << "元音 o(O)数量为 " << oCnt << endl;
cout << "元音 u(U)数量为 " << uCnt << endl;
cout << "空格数量为 " << space_Cnt << endl;
cout << "回车符数量为 " << nCnt << endl;
cout << "制表符数量为 " << tCnt << endl;
cout << "fl数量为 " << flCnt << endl;
cout << "fi数量为 " << fiCnt << endl;
cout << "ff数量为 " << ffCnt << endl;
}
5.14
#include<iostream>
#include<string>
#include<Windows.h>
using namespace std;
int main() {
int Cnt = 1, maxCnt = 1;
string name = "";
string text = "";
string ttee = "";
cin >> text;
while (cin >> ttee) {
if (ttee == text) {
++Cnt;
}
else {
if (Cnt > maxCnt) {
name = text;
maxCnt = Cnt;
}
else {
if (Cnt == maxCnt) {
name += " and "+text;
maxCnt = Cnt;
}
}
text = ttee;
Cnt = 1;
}
}
if (Cnt > maxCnt) {
name = text;
maxCnt = Cnt;
}
else {
if (Cnt == maxCnt) {
name += " and "+text;
maxCnt = Cnt;
}
}
if (name == "") {
cout << "没有连续出现的单词" << endl;
}
else {
cout << name << "连续出现" << maxCnt << "次" << endl;
}
}
5.16
1----while
#include<iostream>
#include<vector>
using namespace std;
int main() {
int v = 0;
vector<int>ivec;
while (cin >> v) {
ivec.push_back(v);
}
for (auto q : ivec) {
cout << q << endl;
}
}
2----for
#include<iostream>
#include<string>
#include<vector>
using namespace std;
int main() {
int n = 0;
cin >> n;
vector<int>ivec;
int m = 0;
for (int i = 0; i <= n; ++i) {
cin >> m;
ivec.push_back(m);
}
for (auto q : ivec) {
cout << q << endl;
}
}
FOR循环统计输入并计入VECTOR，打包输出
5.17
#include<vector>
#include<iostream>
using namespace std;
int main() {
vector<int>ivec1 = { 0,1,2,3 };
vector<int>ivec2 = { 2,6,5,0,1,3 };
int n1 = ivec1.size();
int n2 = ivec2.size();
bool flag = false;
if (n1 == n2) {
cout << "不存在相互嵌套" << endl;
}
else {
if (n1 > n2) {
for (auto q : ivec2) {
flag = false;
for (auto l : ivec1) {
if (l == q) {
flag = true;
}
}if (flag == false)break;
}if (flag == false) {
cout << "短对象不是长对象的前缀" << endl;
}
else {
cout << "短对象是长对象的前缀" << endl;
}
}
else {
for (auto q : ivec1) {
flag = false;
for (auto l : ivec2) {
if (l == q) {
flag = true;
}
}if (flag == false)break;
}if (flag == false) {
cout << "短对象不是长对象的前缀" << endl;
}
else {
cout << "短对象是长对象的前缀" << endl;
}
}
}
}
5.19
#include<iostream>
#include<string>
using namespace std;
int main() {
do {
cout << "请输入两个string字符串" << endl;
string text1 = "", text2 = "";
if (cin >> text1 >> text2) {
if (text1.size() > text2.size()) {
cout << "较短的字符串为" << text2<<endl;
}
else {
cout << "较短的字符串为" << text1<<endl;
}
}
} while (cin);
}
5.20
#include<iostream>
#include<string>
using namespace std;
int main() {
string text;//当成现在的输入
string text0;//当成原来的输入
cin >> text0;
bool flag = true;
while (cin >> text) {
if (text == text0) {
cout << "单词" << text << "重复出现" << endl;
flag = false;
break; }
else {
text0 = text;
}
}if (flag == true) {
cout << "没有单词重复出现" << endl;
}
}
5.21
#include<iostream>
#include<string>
using namespace std;//找到的重复单词必须大写字母开头
int main() {
string text;//当成现在的输入
string text0;//当成原来的输入
cin >> text0;
bool flag = true;
while (cin >> text) {
char t0 = text[0];
if (t0 >= 97 && t0 <= 122) {
text0 = text;
continue;
}
if (text == text0) {
cout << "单词" << text << "重复出现" << endl;
flag = false;
break; }
else {
text0 = text;
}
}if (flag == true) {
cout << "没有单词重复出现" << endl;
}
}
