C Program to Convert the File Contents in Upper-case & Write Contents in a Output File

C Program to Convert the File Contents in Upper-case & Write Contents in a Output File.

⦁ The C library function int toupper(int c) converts lowercase letter to uppercase.

⦁ The declaration for toupper( ) function is as follows:
                             int toupper(int c );

⦁ c - This is the letter to be converted to uppercase.

⦁ This function returns uppercase equivalent to c, if such value exists, else c remains unchanged. The value is returned as an int value that can be implicitly casted to char.

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#include<stdio.h>
#include<process.h>
void main( )
{
   FILE *fp1,*fp2;
   char a;
   clrscr( );
   fp1 = fopen("program1.txt","r");
   if(fp1 == NULL){
   puts("cannot open this file");
   exit(1);
}
   fp2 = fopen("program2.txt","w");
   if(fp2 == NULL){
   puts("Not able to open this file");
   fclose(fp1);
   exit(1);
}
do
{
    a = fgetc(fp1);
    a = toupper(a);
    fputc(a,fp2);
}
while (a! = EOF);
fcloseall( );
getch( );
}

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Explanation

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⦁ Open one file in the read mode another file in the write mode.
fp1 = fopen("program1.txt","r");
fp2 = fopen("program2.txt","w");

⦁ Read file character by character

⦁ toupper( ) function will convert lower case letter to uppercase.
do{
a = fgetc(fp1);
a = toupper(a);
fputc(a,fp2);
}while(a!=EOF);

⦁ We are writing character back to the file.

⦁ Whenever you find End of File character then terminate the process of reading the file and writing the file.

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