File handling - HELP

Question

I’m trying to develop a code whose goal is to read an existing text file and ask the user for a carectere, then the program should return to the user how many times the typed carectere repeats in the read text file. However, the program only returns me the amount of letters existing in the file and I can not solve at all. If anyone can give me a strength, I appreciate it. I need to resolve urgently.

Follow the code below:

#include<stdio.h>
#include<stdlib.h>
#include<locale.h>
#include <ctype.h>

int main()
{
    setlocale(LC_ALL, "Portuguese");
    
    FILE *arquivo;
    char letra;
    int total = 0;
  int i, c;
    
    printf ("Digite um caracter:");
    scanf ("%c", &letra);
    
    if ((arquivo=fopen("conto.txt", "r")) != NULL)
    {   
        while((letra=fgetc(arquivo)) != EOF)
        {
            if(letra || letra == toupper(letra)) total++;
       int getc (FILE *fp);
        }
    }

    fclose(arquivo);
    
    printf ("Existem %i letras '%i' no arquivo.\n", total, letra);
}

Answer 1

From your description what you want is:

#include<stdio.h>
#include<stdlib.h>
#include<locale.h>
#include <ctype.h>

int main()
{
    setlocale(LC_ALL, "Portuguese");
    
    FILE *arquivo;
    char letra;
    int total = 0;
   int c;
    
    printf ("Digite um caracter:");
    scanf ("%c", &letra);
    
    if ((arquivo=fopen("conto.txt", "r")) != NULL)
    {   
        while((c = fgetc(arquivo)) != EOF)
        {
            if(letra == c) total++;
        }
    }

    fclose(arquivo);
    
    printf ("Existem %i letras '%c' no arquivo.\n", total, letra);
}

If you don’t want to differentiate between upper and lower case, then use:

f(toupper(c) == toupper(letra)) total++;