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  1. #include<stdio.h>
  2. int main()
  3. {
  4.     FILE *fileA = fopen("FileA.txt","r");
  5.     FILE *fileB = fopen("FileB.txt","a+"); // 在檔案尾添加資料使用 a+
  6.     if(fileA == NULL || fileB == NULL)
  7.     {
  8.         puts("File open fail.");
  9.         fclose(fileA);
  10.         fclose(fileB);
  11.         return 0;
  12.     }
  13.     const int buffer_size = 4;
  14.     char buffer[buffer_size];
  15.     while(fgets(buffer,buffer_size,fileA))
  16.     {
  17.         fputs(buffer,fileB);
  18.     }
  19.     fclose(fileA);
  20.     fclose(fileB);
  21.  
  22.     fileB = fopen("FileB.txt","r");
  23.     while(fgets(buffer,buffer_size,fileB))
  24.     {
  25.         //puts(buffer);
  26.         printf("%s",buffer);
  27.     }
  28.     fclose(fileB);
  29. }
Runtime error #stdin #stdout 0s 2300KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/EAC3wI
PTT 回答
language:
C (gcc 8.3)
created:
7 years ago
visibility:
secret

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