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C Program File Handling to Convert the Content of File to UpperCase

C Program File Handling to Convert the Content of File to UpperCase

This is the C Programming Example of File Handling to convert 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;
 }
}