Write a C++ program that accepts a string from the user and then replaces all occurrences of the letter e with the letter x.
时间: 2024-05-10 16:19:07 浏览: 15
Here's a sample C++ program that replaces all occurrences of the letter "e" with "x" in a user-input string:
```cpp
#include <iostream>
#include <string>
int main() {
std::string input;
std::cout << "Enter a string: ";
std::getline(std::cin, input);
for (auto& c : input) {
if (c == 'e') {
c = 'x';
}
}
std::cout << "Modified string: " << input << std::endl;
return 0;
}
```
In this program, we first ask the user to input a string using `std::getline()`. We then loop through each character in the string, and if we encounter the letter "e", we replace it with "x". Finally, we output the modified string using `std::cout`.
相关问题
write a c program that accepts a charater using the scanf() function and determines if the character
是一个字母还是一个数字。
可以使用以下代码:
#include <stdio.h>
int main() {
char c;
printf("请输入一个字符:");
scanf("%c", &c);
if (c >= '' && c <= '9') {
printf("输入的是数字\n");
} else if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
printf("输入的是字母\n");
} else {
printf("输入的不是数字也不是字母\n");
}
return ;
}
这个程序首先使用scanf()函数接受一个字符,然后使用if语句判断这个字符是数字还是字母。如果是数字,就输出“输入的是数字”,如果是字母,就输出“输入的是字母”,否则输出“输入的不是数字也不是字母”。
3. Develop an application that accepts a word from the user and calculates and outputs the number of letters in the word. The application should check that only one word was entered. If more than one word was entered, the application should output a message to the user and repeat to allow them to enter the word again. The application should make use of instantiable classes. Name the instantiable class Word.java.
Here is the Word.java class that can be used to develop the application:
```
public class Word {
private String word;
public void setWord(String word) {
this.word = word;
}
public int getLength() {
return word.length();
}
public boolean isSingleWord() {
return word.trim().split("\\s+").length == 1;
}
}
```
The `Word` class has three methods:
- `setWord(String word)` sets the user input as the word to be processed
- `getLength()` calculates and returns the number of letters in the word
- `isSingleWord()` checks if the user input is a single word
Here is an example of how to use the `Word` class in the application:
```
import java.util.Scanner;
public class WordApplication {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
Word word = new Word();
while (true) {
System.out.print("Enter a word: ");
String userInput = input.nextLine();
word.setWord(userInput);
if (word.isSingleWord()) {
System.out.println("The word has " + word.getLength() + " letters.");
break;
} else {
System.out.println("Please enter only one word.");
}
}
input.close();
}
}
```
The `WordApplication` class uses a `Scanner` object to read user input and creates an instance of the `Word` class. It then uses a `while` loop to repeatedly prompt the user to enter a single word until a valid input is received. Once a valid input is received, the application uses the `Word` object to calculate and output the number of letters in the word, and then terminates.