Q3

#include <stdio.h>

void afficher(FILE * stream) {
    printf("\n");
    rewind(stream);
    char c = fgetc(stream);
    while(c != EOF) {
        fputc(c, stdout);
        c = fgetc(stream);
    }
    printf("\n");
}

int main() {
    FILE * stream = fopen("file.txt", "r+");
    afficher(stream);
    printf("\nEnter character:\n");
    char letter;
    scanf("%c", &letter);

    while(letter != 'q') {
        printf("\nEnter offset:\n");
        long offset;
        scanf("%ld", &offset);

        fseek(stream, offset, SEEK_SET);
        fputc(letter, stream);

        afficher(stream);

        printf("\nEnter character:\n");
        scanf("%c", &letter);
        scanf("%c", &letter);
    }

    return 0;
}