Question

How to find non-repeated characters in a string with C++

Answer 1

#include <iostream> 

using namespace std; 
  
void printNonRepeatedCharacters(char *s)  { 
    int ascii_count[256]; 
  
    int i; 
    for (i = 0; *(s+i); i++) 
        if(*(s+i)!=' ') 
            ascii_count[*(s+i)]++; 

    int n = i; 
  
    for (i = 0; i < n; i++) 
        if (ascii_count[*(s+i)] == 1) 
            cout << s[i]; 
} 
  
int main() 
{ 
    char s[] = "c++ programming"; 
    
    printNonRepeatedCharacters(s); 
    
    return 0; 
} 


/*
run:

cpoain

*/

 

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Answer 2

#include <iostream> 

using namespace std; 
  
string getNonRepeatedCharacters(char *s) { 
    int ascii_count[256]; 
  
    int i; 
    for (i = 0; *(s+i); i++) 
        if(*(s+i)!=' ') 
            ascii_count[*(s+i)]++; 
    int n = i; 
  
    string new_s = "";
    for (i = 0; i < n; i++) 
        if (ascii_count[*(s+i)] == 1) 
            new_s += s[i]; 
    
    return new_s;
} 
  
int main() 
{ 
    char s[] = "c++ programming"; 
    
    string new_s = getNonRepeatedCharacters(s); 
    
    cout << new_s; 
    
    return 0; 
} 


/*
run:

cpoain

*/

 

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