代码中出现奇怪的错误：杂散'\239'、'\187'和'\191'以及程序中

My code

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
    char *str, c;
    int x = 0, y = 1;

    str = (char*)malloc(sizeof(char));

    printf("Inserisci stringa principale: ");

    while (c != '\n')
    {
        // Read the input from keyboard standard input
        c = getc(stdin);

        // Re-allocate (resize) memory for character read to be stored
        str = (char*)realloc(str, y * sizeof(char));

        // Store read character by making pointer point to c
        str[x] = c;

        x++;
        y++;
    }

    str[x] = '\0'; // At the end append null character to mark end of string

    printf("\nLa stringa inserita: %s", str);

    char *sub, b;
    int w = 0, z = 1;

    sub = (char*)malloc(sizeof(char));

    printf("Immetti sottostringa da cercare: ");

    while (b != '\n')
    {
        // Read the input from keyboard standard input
        b = getc(stdin);

        // Re-allocate (resize) memory for character read to be stored
        sub = (char*)realloc(sub, z * sizeof(char));

        // Store read character by making pointer point to c
        sub[w] = b;

        w++;
        z++;
    }

    sub[w] = '\0'; // At the end append null character to mark end of string

    char *p1, *p2, *p3;
    int i=0, j=0, flag=0, occurrences=0;

    p1 = str;
    p2 = sub;

    for(i = 0+1; i<strlen(str); i++)
    {
        if(*p1 == *p2)
        {
            p3 = p1;

            for(j = 0; j<strlen(sub); j++)
            {
                if(*p3 == *p2)
                {
                    p3++;
                    p2++;
                }
                else
                    break;
            }
            p2 = sub;
            if(j + 1 == strlen(sub))
            {
                flag = 1;
                occurrences = occurrences + 1;
                printf("\nnel numero di volte : %d\n",occurrences );
                printf("\nSottostringa trovata all'indice : %d\n",i );
            }
        }
        p1++;
    }

    if(flag==0)
    {
         printf("Sottostringa non trovata");
    }

    free(str);
    free(sub);
    return (0);
}

当我尝试编译时收到此错误：

myfile.h:1: error: stray '\239' in program
myfile.h:1: error: stray '\187' in program
myfile.h:1: error: stray '\191' in program

我试图找到解决方案，但我完全不知道这是什么，这个错误。

我尝试编译很多次，每次都收到这个错误。为什么？

字节序列239, 187 and 191 is the UTF-8 字节顺序标记 (BOM) https://en.wikipedia.org/wiki/Byte_order_mark#UTF-8.

您没有使用纯文本编辑器，或者要求您的编辑器使用带有 BOM 的 UTF-8 进行保存。不要那样做。另存为纯文本.