C 将输入记录到文件？

Question

我正在开发一个将输入记录到文件的程序。这是我当前的代码：

#include <stdio.h>
#include <curses.h>
#include <signal.h>
#define WAIT 3
#define INCORRECT "Incorrect input\n"
#define FILENAME ".xintrc"

int stop();

int main()
{
    char first[10], last[10];
    int i;
    FILE *fp, *fopen()
    initscr();
    scanf("%[^\n]", first);
    getchar();
    noecho();
    scanf("%[^\n]", last);
    printf("\n");
    getchar();
    echo();
    sleep(WAIT);
    if((fp = fopen(FILENAME, "a")) != NULL){
    fprintf(fp, "First:   %s Last: %s\n", first, last);
    fclose(fp);
  }

    printf(INCORRECT);
    endwin();
 }
    stop()
 {
    endwin();
    exit(0);
 }

当我编译时，我收到此错误：

input1.c: In function ‘main’:
input1.c:15: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘initscr’
input1.c: In function ‘stop’:
input1.c:35: warning: incompatible implicit declaration of built-in function ‘exit’

Answer 1

好吧，您需要在末尾添加一个分号：

FILE *fp, *fopen(); /* ; here! */

您可能还希望 stop 来匹配其原型：

/* includes */
int stop();

/* main etc */
int main(int argc, char** argv)
{
    /* main code */
}

int stop()
{
    endwin();
    exit(0);
}

对于 exit() 您需要 #include

哦，要编译它，假设它名为 test.c，然后使用 gcc -lcurses test.c -o test。这告诉 gcc 您想要与 libcurses 链接。

Answer 2

您的代码有很多问题。请参阅我嵌入的注释，了解可以编译并可能以更理智的方式执行您想要的操作的版本。

#include <stdio.h>
#include <stdlib.h> /* for _Exit() */
#include <string.h> /* for strcspn() */
/* #include <curses.h> you don't need curses for such a simple program */
/* #include <signal.h> this header is not needed */

#define WAIT 3
#define INCORRECT "Incorrect input\n"
#define FILENAME "testfile"

void stop(void); /* match the new prototype */

int main(void) /* main() always returns int, use void if not using argc/argv */
{
  char first[10], last[10];
  /* int i;  You never use this */
  FILE *fp; /* You don't need *fopen() here */

  /* initscr(); */
  /* noecho(); */

  printf("Enter first name: "); /* Added by me */
  fgets(first, sizeof(first), stdin); /* Don't use scanf, fgets prevents overflows */
  first[strcspn(first,"\n")] = '\0'; /* chomp the newline if it exists */

  printf("Enter last name: "); /* Added by me */
  fgets(last, sizeof(last), stdin); /* Don't use scanf, fgets prevents overflows */
  last[strcspn(last,"\n")] = '\0'; /* chomp the newline if it exists */

  /* echo(); */
  sleep(WAIT);

  if((fp = fopen(FILENAME, "a")) != NULL){
    fprintf(fp, "First:   %s Last: %s\n", first, last);
    fclose(fp);
    stop(); /* You never call this, i'm guessing you want it here */
  }

  printf(INCORRECT); /* only called if fopen() fails */

  /* endwin(); */

  return 0; /* mandatory return for main() */
}

void stop(void) /* Use 'void' if the func takes no params and returns nothing */
{
  /* endwin(); */
  _Exit(0); /* _Exit is apart of C99 */
}