C Program to Convert the Content of File to UpperCase

This C Program converts the content of file to UpperCase.

Here is source code of the C Program to convert the content of file to UpperCase. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

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/*
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 * C Program to Convert the Content of File to UpperCase

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 */
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#include <stdio.h>
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int to_upper_file(FILE *);
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int main(int argc,char *argv[])
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{
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    FILE *fp;
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    int status;
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    if (argc == 1)
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    {
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        printf("Insufficient Arguments:");

        printf("No File name is provided at command line");

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        return;
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    }
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    if (argc > 1)
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    {
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        fp = fopen(argv[1],"r+");
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        status = to_upper_file(fp);
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        /* 
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          *If the status returned is 0 then the coversion of file content was completed successfully

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         */
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        if (status == 0)
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        {
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            printf("\n The content of \"%s\" file was successfully converted to upper case\n",argv[1]);

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            return;
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        }
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        /*
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          * If the status returnes is -1 then the conversion of file content was not done

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          */
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        if (status == -1)
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        {
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            printf("\n Failed to convert");

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            return;
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        } 
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   }
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}
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/*
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 * convert the file content to uppercase

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 */
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int to_upper_file(FILE *fp)
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{
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    char ch;
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    if (fp == NULL)
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    {
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        perror("Unable to open file");
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        return -1;
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    }
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    else
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    {
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        /*
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          * Read the file content and convert to uppercase

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          */
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        while (ch != EOF)
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        {
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            ch = fgetc(fp);
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            if ((ch >= 'a') && (ch <= 'z'))

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            {
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                ch = ch - 32;
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                fseek(fp,-1,SEEK_CUR);
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                fputc(ch,fp);
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            }    
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        }
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        return 0;
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    }
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}
```

/* Input file : mydata
$ cat mydata
This is Manish
I had worked in Wipro and Cisco
*/
 
$ gcc file3.c
$ a.out mydata
The content of "mydata" file was successfully converted to upper case
 
/* "mydata" after conversion
$ cat mydata
THIS IS MANISH
I HAD WORKED IN WIPRO AND CISCO
*/