这里有什么问题（c程序）。它显示了太多参数的格式。对于所有“scanf”行

Question

FILE* f;
fopen("vaccine.txt", "w");              //Open and write on the vaccine.txt file

for (int i = 0; i < 5; i++) {                   //Allow up to 5 vaccine's recorded at once!
    printf("\nName of vaccine %d: ", i + 1);
    scanf("%s", vacname, sizeof(vacname), f);
    printf("\tVaccine Code: ");
    scanf("%s",code, sizeof(code), f);
    printf("\tProducing Country: ");
    scanf("%s", country, sizeof(country), f);
    printf("\tDosage: ");
    scanf("%d", &dosage, f);
    printf("\tPopulation: ");
    scanf("%f", &population, f);
    printf("\tQuantity: ");
    scanf("%d", &quantity, f);

    fprintf(f, "%s\n%s\n%s\n%d\n%.2f\n%d\n", vacname, code, country, dosage, population, quantity);
}
fclose(f);
printf("\nVaccine data successfully recorded!\n\n");    //Notify user of the program successful ru


n
};

Answer 1

您不必使用 scanf 指定大小。您可以使用 fgets；它是缓冲安全的

scanf("%s",variable);