C++ program to remove all character from string except alphabets
Removing all characters from the string except alphabets.
In this article we will be learning about Removing all characters from the string except alphabets.
Removing all characters excepts alphabets means removing special characters like ‘*’, ‘?’, ‘@’, etc. and numeric characters like ‘1’, ‘2’, ‘3’, etc. from the input string.
input string :- 1_pre9pins34a
Output sting:- prepinsta
Algorithm:
- Initialize the variables.
- Accept the input.
- Initialize a for loop and terminate it at the end of string.
- Iterate each character through the loop.
- Remove non alphabetical characters using while loop.
- Store only alphabetical characters from the string using another for loop
- Print result.
C++ programming code to remove all characters from string except alphabets
Run
#include <iostream> using namespace std; int main() { //Initializing variable. char str[100]; int i, j; //Accepting input. cout<<"Enter a string : "; gets(str); //Iterating each character and removing non alphabetical characters. for(i = 0; str[i] != '\0'; ++i) { while (!( (str[i] >= 'a' && str[i] <= 'z') || (str[i] >= 'A' && str[i] <= 'Z') || str[i] == '\0') ) { for(j = i; str[j] != '\0'; ++j) { str[j] = str[j+1]; } str[j] = '\0'; } } //Printing output. cout<<"After removing non alphabetical characters the string is :"; puts(str); return 0; }
Output: Enter a string : *1prep_insta* After removing non alphabetical characters the string is :prepinsta
Note
To do this first we will iterate each character of the string through a for loop then we will check if the character iterated is an alphabetic character or not. If it is found to be an alphabetical character than we will store it else we will not. In this way we will get a string that have only alphabetical characters as an output.
Method 2
Run
#include <bits/stdc++.h> using namespace std; // function to remove characters and // print new string void removeSpecialCharacter(string s) { for (int i = 0; i < s.size(); i++) { // Finding the character whose // ASCII value fall under this // range if (s[i] < 'A' || s[i] > 'Z' && s[i] < 'a' || s[i] > 'z') { // erase function to erase // the character s.erase(i, 1); i--; } } cout << s; } // driver code int main() { string s = "P*re;p..ins't^a?"; removeSpecialCharacter(s); return 0; }
Output
Prepinsta
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#include
using namespace std;
int main(int argc, char const *argv[])
{
string str=”P*re;p..ins’t^a?”;
int n=str.length();
string res=””;
for(int i=0; i<n; i++){
if(isdigit(str[i]))
continue;
if(isalpha(str[i]))
res+=str[i];
else
continue;
}
cout<<res;
return 0;
}
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#include
#include
using namespace std;
int main(){
string str;
cout<<"enter a string"<= ‘a’ && str[i] = ‘A’ && str[i] <= 'Z'))
{
cout<<str[i];
}
}
return 0;
}
//another simple solution
#include
#include
using namespace std;
int main ()
{
char ch[100];
cin>>ch;
int count=0;
int len=strlen(ch);
for(int i=0; i=’A’&& ch[i]=’a’&& ch[i]<='z'))
{
continue;
}
else
{
for(int j=i; j<len; j++)
{
ch[j]=ch[j+1];
}
len–;
i–;
}
}
cout<<ch;
}
#include
#include
using namespace std;
int main()
{
char a[100],b[100];
int i=0,j=0,k=-1;
gets(a);
for(i=0;a[i]!=’\0′;i++)
{
if(a[i]>=’a’&&a[i]=’A’&&a[i]<='Z')
{
k++;
a[k]=a[i];
}
else
{
continue;
}
}
a[k+1]='\0';
puts(a);
}