[英]how to convert Lower case letters to upper case letters & and upper case letters to lower case letters
[英]how do i create a program to filter out lower case and upper case letters from a string?
我想編寫一個代碼來分別過濾小寫和大寫字母,並且必須顯示每種字符的數量。請幫助
提示 :遍歷String
,可以檢查字母是否為小寫大寫,如下所示:
Character.isUpperCase(str.charAt(i)); //returns true if char is upper case
和
Character.isLowerCase(str.charAt(i)); //returns true if char is lower case
其中str
是您的字符串,而i
是用於遍歷字符串的變量。 希望這可以幫助。
好吧,我對Java沒有太多的了解,但是我可以用C ++給出解決方案。 也許它可以幫助您用Java實現
#include <stdio.h>
#include <string>
#include <iostream>
#include <vector>
using namespace std;
int main()
{
std::string s1;
std::vector< pair<char,int> > uppercase;
std::vector< pair<char,int> > lowercase;
std::vector< pair<char,int> >::iterator it;
getline(cin,s1);
int arr[255]={0};
for(int i=0;i<s1.size();i++)
{
arr[s1[i]]++;
}
for(int i=0;i<s1.size();i++)
{
if(int(s1[i])<97)
{
uppercase.push_back(make_pair(s1[i],arr[s1[i]]));
}
else
{
lowercase.push_back(make_pair(s1[i],arr[s1[i]]));
}
}
cout<<"\n\n";
for(it=uppercase.begin();it!=uppercase.end();it++)
{
cout<<it->first<<" "<<it->second<<"\n";
}
for(it=lowercase.begin();it!=lowercase.end();it++)
{
cout<<it->first<<" "<<it->second<<"\n";
}
return 0;
}
您可以進一步改善它。
該代碼將起作用,但我想我剛剛完成了您的作業
int i;
String str = "Hello Stackoverflow! WaZZuP";
String lower = "";
String upper = "";
String other = "";
for (i = 0; i < str.length(); i++){
if (Character.isUpperCase(str.charAt(i))){
upper += str.charAt(i);
}else if (Character.isLowerCase(str.charAt(i))){
lower += str.charAt(i);
}else{
other += str.charAt(i);
}
}
System.out.println("In the String '" + str + "' there are " + upper.length() + " Upper Case, " + lower.length() + " Lower Case and " + other.length() + " Other Characters");
System.out.println("Upper Chars are: '" + upper + "'");
System.out.println("Lower Chars are: '" + lower + "'");
System.out.println("Other Chars are: '" + other + "'");
public class Test1 {
public static void main(String[] args) {
String s = "My name is Biraj.";
String up = "";
String down = "";
for(int i=0;i<s.length();i++) {
if(Character.isUpperCase(s.charAt(i))) {
up = up+s.charAt(i);
} else {
down = down+s.charAt(i);
}
}
System.out.println(up);
System.out.println(down);
}
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.