c - 写入文件并使用带循环的 if 语句

Question

我正在创建一个简单的系统，供人们输入基本详细信息，将它们打印在屏幕上，一旦确认写入文本文件，信息是否错误，用户输入编辑或循环回开头报告，如果输入另一个输入，它会再次询问问题。我正在努力让打印到文件工作和两端循环。

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

int get_line(const char *prompt, char *dest, size_t size) {
  printf("%s", prompt);
  fflush(stdout);
  if (fgets(dest, size, stdin) == NULL) {
    dest[0] = '\0';
    return 0;
  }
  dest[strcspn(dest, "\n")] = '\0';  // Lop off potential trailing '\n'
  return 1;
}

int main(void) 
{
    char first_name[20], surname[20], street_no[10], street_name[40], postcode[10], contact_no[20], save_edit_qu[10];
    int dd, mm, yy;
    get_line(" Enter first name:\n", first_name, sizeof first_name);
    get_line(" Enter surname:\n", surname, sizeof surname);
    get_line(" Contact Number\n", contact_no, sizeof contact_no);
    get_line(" Street Number\n", street_no, sizeof street_no);
    get_line(" Street Name\n", street_name, sizeof street_name);
    get_line(" Postcode\n", postcode, sizeof postcode);

    printf(" First Name : %s\n", first_name);
    printf(" Surname    : %s\n", surname);
    printf(" Contact No.: %s\n", contact_no);
    printf(" Street No. : %s\n", street_no);
    printf(" Stret Name : %s\n", street_name);
    printf(" Postcode   : %s\n", postcode);


    get_line(" If the informations above is correct please enter SAVE/if you wish to change any informations please enter edit", save_edit_qu, sizeof save_edit_qu);
    if (save_edit_qu[0] == 'SAVE' || save_edit_qu[0] == 'save') {
    //write info to file
    }
    if (save_edit_qu[0] == 'EDIT' || save_edit_qu[0] == 'edit') {
    //loop back to beginning of report
    }
    else if ()//loop to beginning of SAVE/EDIT QU

    return 0;
}

Answer 1

使用 strcmp() 并使用双引号 ""表示字符串!

if (strcmp(save_edit_qu,"SAVE") == 0 || strcmp(save_edit_qu,"save") == 0) {

或使用单引号仅测试第一个字符，如下所示

if (save_edit_qu[0] == 'S' || save_edit_qu[0] == 's') {