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.

```
/*
```

 * C Program to Convert the Content of File to UpperCase

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

        printf("Insufficient Arguments:");

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

```
        return;
```
```
    }
```
```
    if (argc > 1)
```
```
    {
```
```
        fp = fopen(argv[1],"r+");
```
```
        status = to_upper_file(fp);
```
```
 
```
```
        /* 
```

          *If the status returned is 0 then the coversion of file content was completed successfully

```
         */
```
```
 
```
```
        if (status == 0)
```
```
        {
```

            printf("\n The content of \"%s\" file was successfully converted to upper case\n",argv[1]);

```
            return;
```
```
        }
```
```
        /*
```

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

```
          */
```
```
        if (status == -1)
```
```
        {
```

            printf("\n Failed to convert");

```
            return;
```
```
        } 
```
```
   }
```
```
}
```
```
 
```
```
/*
```

 * convert the file content to uppercase

```
 */
```
```
int to_upper_file(FILE *fp)
```
```
{
```
```
    char ch;
```
```
 
```
```
    if (fp == NULL)
```
```
    {
```
```
        perror("Unable to open file");
```
```
        return -1;
```
```
    }
```
```
    else
```
```
    {
```
```
        /*
```

          * Read the file content and convert to uppercase

```
          */
```
```
        while (ch != EOF)
```
```
        {
```
```
            ch = fgetc(fp);
```

            if ((ch >= 'a') && (ch <= 'z'))

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

/* 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
*/

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