Copy program that prompts the user to enter the name of a text file to act as the source file and the name of an output file - C File

C examples for File:File Operation

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Description

Copy program that prompts the user to enter the name of a text file to act as the source file and the name of an output file

Demo Code

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

#define SLEN 81/*  ww w. j a v  a2s. c om*/

void get(char * string, int n);

int main(void){
  int ch;
  FILE * fsource;
  FILE * fdest;
  char source[SLEN];
  char dest[SLEN];

  printf("Enter a source file: ");
  get(source, SLEN);
  printf("Enter a destination file: ");
  get(dest, SLEN);

  if ((fsource = fopen(source, "r")) == NULL)
  {
    fprintf(stderr, "Could not open file %s for read.\n", source);
    exit(EXIT_FAILURE);
  }
  if ((fdest = fopen(dest, "w")) == NULL)
  {
    fprintf(stderr, "Could not open file %s for write.\n", dest);
    exit(EXIT_FAILURE);
  }
  while ((ch = getc(fsource)) != EOF)
  {
    if (islower(ch))
      ch = toupper(ch);
    putc(ch, fdest);
  }

  fclose(fsource);
  fclose(fdest);

  return 0;
}

void get(char * string, int n)
{
  fgets(string, n, stdin);
  while (*string != '\0'){
    if (*string == '\n'){
      *string = '\0';
      break;
    }
    string++;
  }
}

Result


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