Problem statement:- Program to Find a first non-repeating character in a string.
Example:-
Input: Given
String=C STRING PROGRAM
Output:C
Input: Given
String=string question
Output: r
Sample Input/Output:-
Data requirement:-
Input Data:- str
Output Data:-ch
Output Data:-ch
Additional Data:- i, arr
Program in C
Here is the source code of the C Program to Find the first non-repeating character in a string.
Code:
#include<stdio.h>
#include<string.h>
main()
{
char str[30];
printf("Enter your String:");
scanf("%[^\n]",str);
int arr[256]={0},i;
for(i=0;i<strlen(str);i++)
{
if(str[i]!=' ')
arr[str[i]]++;
}
char ch=' ';
printf("First Non-repeating character in a given string is:");
for(i=0;i<strlen(str);i++)
{
if(arr[str[i]]==1){
ch=str[i];
break;
}
}
printf("%c",ch);
}
Enter your String:C STRING PROGRAM
First Non-repeating character in a given string is:C
Program in C++
Here is the source code of the C++ Program to Find the first non-repeating character in a string.
Code:
#include<iostream>
#include <cstring>
using namespace std;
main()
{
string str;
cout<<"Enter your String:";
getline(cin,str);
int in,len=0,i;
for(in=0;str[in]!='\0';in++)
{
len++;
}
int arr[256]={0};
for(i=0;i<len;i++)
{
if(str[i]!=' ')
arr[str[i]]++;
}
char ch=' ';
cout<<"First Non-repeating character in a given string is:";
for(i=0;i<len;i++)
{
if(arr[str[i]]==1){
ch=str[i];
break;
}
}
cout<<ch;
}
Enter your String:string question
First Non-repeating character in a given string is:r
Program in Java
Here is the source code of the Java Program to Find the first non-repeating character in a string.
Code:
import java.util.Scanner;
public class FirstNonRepeatingCharacter {
public static void main(String[] args) {
Scanner cs=new Scanner(System.in);
String str;
System.out.println("Enter your String:");
str=cs.nextLine();
int i;
int arr[]=new int[256];
for(i=0;i<str.length();i++)
{
if(str.charAt(i)==' ')
continue;
arr[str.charAt(i)]++;
}
char ch=' ';
System.out.print("First Non-repeating character in a given string is:");
for(i=0;i<str.length();i++)
{
if(arr[str.charAt(i)]==1){
ch=str.charAt(i);
break;
}
}
System.out.print(ch);
cs.close();
}
}
Enter your String:
csinfo360
First Non-repeating character in a given string is:c
Program in Python
Here is the source code of the Python Program to Find the first non-repeating character in a string.
Code:
str=input("Enter Your String:")
arr=[0]*256
for i in range(len(str)):
if str[i]!=' ':
num=ord(str[i])
arr[num]+=1
ch=' '
print("First Non-repeating character in a given string is: ",end="")
for i in range(len(str)):
if arr[ord(str[i])] ==1:
ch=str[i]
break
print(ch,end="")
Enter Your String:python string question
First Non-repeating character in a given string is: p
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