#include"stdio.h"
void main() {
char aj1='1', aj2='2', aj3='3', aj4='4';
FILE *fp1;
FILE *fp2;
FILE *fp3;
FILE *fp4;
char ch;
if ((fp1 = fopen("123.txt", "r")) == NULL) {
printf("文件打开失败！\n");
}
aj1 = fgetc(fp1);
aj2 = fgetc(fp2);
aj3 = fgetc(fp3);
aj4 = fgetc(fp4);
fclose(fp1);
fclose(fp2);
fclose(fp3);
fclose(fp4);
}

#include"stdio.h"
void main() {
char aj1='1', aj2='2', aj3='3', aj4='4';
FILE *fp1;
FILE *fp2;
FILE *fp3;
FILE *fp4;
fp1 = fopen("aj1.txt", "r");
fp2 = fopen("aj2.txt", "r");
fp3 = fopen("aj3.txt", "r");
fp4 = fopen("aj4.txt", "r");
aj1 = fgetc(fp1);
aj2 = fgetc(fp2);
aj3 = fgetc(fp3);
aj4 = fgetc(fp4);
fclose(fp1);
fclose(fp2);
fclose(fp3);
fclose(fp4);
}
一楼代码错了。。。

顶

我有点不懂你的意思。前面给变量赋了值，后面又赋值。你是不是想把之前的值存到文本中去？

#include"stdio.h"
int main(void)
{
char aj1, aj2, aj3, aj4;
FILE *fp1;
FILE *fp2;
FILE *fp3;
FILE *fp4;
fp1 = fopen("/sdcard/aj1.txt", "r");
fp2 = fopen("/sdcard/aj2.txt", "r");
fp3 = fopen("/sdcard/aj3.txt", "r");
fp4 = fopen("/sdcard/aj4.txt", "r");
aj1 = fgetc(fp1);
aj2 = fgetc(fp2);
aj3 = fgetc(fp3);
aj4 = fgetc(fp4);
fclose(fp1);
fclose(fp2);
fclose(fp3);
fclose(fp4);
printf("%c %c %c %c",aj1,aj2,aj3,aj4);
return 0;
}

首先，相对路径肯定是不行的，当前程序是存在c4所在data里面。所以你要弄绝对路径。而你这个也只能读取每个文本的第一个字节。

你自己检查吧。不是输出参数或格式问题就是文本的第一个符号不止一个字节

#include<stdio.h>
int main(void) {
FILE *fp1;
FILE *fp2;
FILE *fp3;
FILE *fp4;
char aj1, aj2, aj3, aj4;
printf("请输入按键1\n");
gets(aj1);
printf("请输入按键2\n");
gets(aj2);
printf("请输入按键3\n");
gets(aj3);
printf("请输入按键4\n");
gets(aj4);
fp1 = fopen("/sdcard/aj1.txt", "w");
fp2 = fopen("/sdcard/aj2.txt", "w");
fp3 = fopen("/sdcard/aj3.txt", "w");
fp4 = fopen("/sdcard/aj4.txt", "w");
if (fp1 == NULL) {
printf("不能定义按键！");
return 0;
}
fprintf(fp1, "%c", aj1);
fprintf(fp2, "%c", aj2);
fprintf(fp3, "%c", aj3);
fprintf(fp4, "%c", aj4);
fclose(fp1);
fclose(fp2);
fclose(fp3);
fclose(fp4);
return 0;
}
和之前一样，位置也是对的。@右眼星辰

aj是单个字符，不是字符串，用getchar而不是gets

楼主，通过这么多次对话，我发现你的基础不扎实。
建议你买一本关于c的书看看，打牢基本功！
加油

逻辑问题，既然打开文件失败，那么是不是就没有必要再读取？