Instead of using a string would like to read in a text file so user doesn't have to input anything

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//
//  main.cpp
//  Threshold.cpp
//
//  Created by Mikel Wille on 11/30/17.
//  Copyright © 2017 The Error 404. All rights reserved.
//

#include<stdio.h>
#include<iostream>
#include<iterator>
using namespace std;
int main()
{
    int others = 0, numbers = 0, space = 0, punct = 0, character = 0, letters = 0,upper = 0, lower = 0, digit=0, special=0;
    char ch[80];
    int i;
    printf("\nEnter The String : ");
    gets(ch);
    for (i = 0; ch[i]!='\0';i++)
        int main = 0;

        string line; // variable used to read a line from file
        ifstream myfile("/Users/TheKid/Documents/Threshold.cpp/Threshold.cpp/text.data");
        
        if (myfile.is_open()) // checking if the file was opened
            
    {
        if (ch[i] != ' ')
            character++;
        if (ch[i] >= 'a' && ch[i] <= 'z' && ch[i] >= 'A' && ch[i] >= 'Z' && ch[i] != ' ') // Checking for spaces
            letters++;
        if (ch[i] >= 'A' && ch[i] <= 'Z')
            upper++;
        else if (ch[i] >= 'a' && ch[i] <= 'z')
            lower++;
        else if(ch[i] >='0' && ch[i] <='9')
            digit++;
        else if (ch[i] != ',' && ch[i] !=';' && ch[i] != '!' && ch[i] != ' ' && ch[i] != '.' && ch[i] != ':' && ch[i] != '?' && ch[i] != '"' && ch[i] != '-' && ch[i] != '+' && ch[i] != '/')
            special++;
        else if(ch[i]!=' ')
            punct++;
        else if (ch[i] == ' ')
            space++;
        else if (digit >='0' && ch[i] !='9')
            numbers++;
        else if (ch[i] != '@'&& ch[i] != '#' && ch[i] != '$' && ch[i] != '%' && ch[i] != '^' && ch[i] != '*' && ch[i] != '(' && ch[i] != ')' && ch[i] != '_' && ch[i] != '+' && ch[i] != '{' && ch[i] !='}' && ch[i] != '<' && ch[i] != '>' && ch[i] !='~' && ch[i] != '`')
            others++;
    }
    
    printf ("\nNnumber of characters: %d", character);
    printf ("\nNnumber of letters: %d", upper + lower);
    printf ("\nNumber of Uppercase Letters: %d", upper);
    printf ("\nNumber of Lowercase Letters: %d", lower);
    printf ("\nNumber of Digits: %d", digit);
    printf ("\nThe number of special characters: %d", special);
    printf ("\nPunctuation Characters: %d", punct);
    printf ("\nNumber of spaces: %d", space);
    printf ("\nNumber of words: %d", space +1); 
    printf ("\nNumber of numbers: %d" , digit / 2   );
    printf ("\nNumber of others:  %d", others);
}


This is my code to read in file
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string line; // variable used to read a line from file
        ifstream myfile("/Users/TheKid/Documents/Threshold.cpp/Threshold.cpp/text.data");
        
        if (myfile.is_open()) // checking if the file was opened 


But I get the following error
[b]Implicit instantiation of undefined template 'std::__1::basic_ifstream<char, std::__1::char_traits<char> >'
[/b]
Last edited on
You need to include <fstream>

BTW. Why this mixture between C and C++ ?
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