checking-panagram.cpp

// A C++ Program to check if the given 
// string is a pangram or not 
#include<bits/stdc++.h> 
using namespace std; 
  
// Returns true if the string is pangram else false 
bool checkPangram (string &str) 
{ 
    // Create a hash table to mark the characters 
    // present in the string 
    vector<bool> mark(26, false); 
  
    // For indexing in mark[] 
    int index; 
  
    // Traverse all characters 
    for (int i=0; i<str.length(); i++) 
    { 
        // If uppercase character, subtract 'A' 
        // to find index. 
        if ('A' <= str[i] && str[i] <= 'Z') 
            index = str[i] - 'A'; 
  
        // If lowercase character, subtract 'a' 
        // to find index. 
        else if('a' <= str[i] && str[i] <= 'z') 
            index = str[i] - 'a'; 
  
        // Mark current character 
        mark[index] = true; 
    } 
  
    // Return false if any character is unmarked 
    for (int i=0; i<=25; i++) 
        if (mark[i] == false) 
            return (false); 
  
    // If all characters were present 
    return (true); 
} 
  
// Driver Program to test above functions 
int main() 
{ 
    string str = "The quick brown fox jumps over the"
                 " lazy dog"; 
  
    if (checkPangram(str) == true) 
        printf (""%s" is a pangram", str.c_str()); 
    else
        printf (""%s" is not a pangram", str.c_str()); 
  
    return(0); 
}