Do/While not recognizing the character to end loop in C

Question

I'm trying to write some characters in this "arq.txt" file and it works well at the beginning, but when I type zero to restart the program, the Do / While loop no longer recognizes zero I can't get out of it anymore. Please help me! Here is my code:

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

int main()
{
    FILE *p;
    char ch;
    int c = 1, i, cont = 0;

    while(c) {

        printf("\n-------- DIGITANDO VALORES --------\n");

        p = fopen("arq.txt", "w");
        do {
            printf("Type: ");
            scanf("%c", &ch);
            getchar();
            putc(ch, p);
            cont++;
        } while(ch != '0');
        fclose(p);

        p = fopen("arq.txt", "r");
        for(i = 0; i <= cont; i++) {
            ch = fgetc(p);
            printf("%c\n", ch);
        }
        fclose(p);

        printf("If you wish to finish program, please type zero: ");
        scanf("%d", &c);
    }

}

Answer 1

scanf("%c", &ch); reads left-over newline from scanf("%d", &c);.

Try scanf("%c", &ch); getchar(); --> scanf(" %c", &ch);. Note space