C程序，用于将文件中的小写字母转换为大写字母，反之亦然-yiteyi-C++库

从小写到大写

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给定一个文本文件（gfg.txt），我们的任务是将文件的所有小写字符转换为大写。

例如：

Input: (content inside file (gfg.txt)
Geeks Classes:
An extensive classroom programme
by GeeksforGeeks to build and enhance
Data Structures and Algorithm concepts

Output: (content inside file (gfg.txt)
GEEKS CLASSES:
AN EXTENSIVE CLASSROOM PROGRAMME
BY GEEKSFORGEEKS TO BUILD AND ENHANCE
DATA STRUCTURES AND ALGORITHM CONCEPTS

方法：打开文件gfg。文本输入阅读模式检查打开或定位文件时是否有任何错误。如果是，则抛出错误消息。

如果找到该文件，则在while循环的帮助下，使用图珀将该文件的大小写转换为大写。使用关闭文件 fclose（） 函数中传递文件指针。

                       // C++ program to convert                     
                       // all lower case characters of a file                     
                       // into Upper Case                     
                       #include <bits/stdc++.h>                     
                                
                       int                                  main()                     
                       {                     
                                             // initializing the file pointer                     
                                             FILE                                  * fptr;                     
                                
                                             // name of the file as sample.txt                     
                                             char                                  file[50] = {                                  "gfg.txt"                                  };                     
                                             char                                  ch;                     
                                
                                             // opening the file in read mode                     
                                             fptr =                                  fopen                                  (file,                                  "r"                                  );                     
                                             ch =                                  fgetc                                  (fptr);                     
                                
                                             // converting into upper case                     
                                             while                                  (ch != EOF) {                     
                                
                                             // converting char to upper case                     
                                             ch =                                  toupper                                  (ch);                     
                                             printf                                  (                                  "%c"                                  , ch);                     
                                             ch =                                  fgetc                                  (fptr);                     
                                             }                     
                                
                                             // closing the file                     
                                             fclose                                  (fptr);                     
                                
                                             return                                  0;                     
                       }                     

输出：

GEEKS CLASSES:
AN EXTENSIVE CLASSROOM PROGRAMME
BY GEEKSFORGEEKS TO BUILD AND ENHANCE
DATA STRUCTURES AND ALGORITHM CONCEPTS

大写至小写： 与上述类似，仅使用小写取代图珀例如：

Input: (content inside file (gfg.txt)
Geeks Classes:
AN EXTENSIVE CLASSROOM PROGRAMME
BY GEEKSFORGEEKS TO BUILD AND ENHANCE
DATA STRUCTURES AND ALGORITHM CONCEPTS

Output: (content inside file (gfg.txt)
geeks classes:
an extensive classroom programme
by geeksforgeeks to build and enhance
data structures and algorithm concepts

                       // C++ program to convert all upper                     
                       // case characters of a file                     
                       // into lower Case                     
                       #include <bits/stdc++.h>                     
                                
                       int                                  main()                     
                       {                     
                                
                                             // initializing the file pointer                     
                                             FILE                                  * fptr;                     
                                
                                             // name of the file as gfg.txt                     
                                             char                                  file[30] = {                                  "gfg.txt"                                  };                     
                                             char                                  ch;                     
                                
                                             // opening the file in read mode                     
                                             fptr =                                  fopen                                  (file,                                  "r"                                  );                     
                                             ch =                                  fgetc                                  (fptr);                     
                                
                                             // converting into lower case                     
                                             while                                  (ch != EOF) {                     
                                
                                             // converting char to lower case                     
                                             ch =                                  tolower                                  (ch);                     
                                             printf                                  (                                  "%c"                                  , ch);                     
                                             ch =                                  fgetc                                  (fptr);                     
                                             }                     
                                
                                             // closing the file                     
                                             fclose                                  (fptr);                     
                                
                                             return                                  0;                     
                       }                     

输出：

geeks classes:
an extensive classroom programme
by geeksforgeeks to build and enhance
data structures and algorithm concepts

注：

1.通过使文件为gfg脱机运行此程序。并在其中存储一些字符。 2.确保文件与代码中使用的名称相同，并且位于存储程序的同一文件夹中。

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