Verify the user input and display file content : Command Line Parameters « Development « C / ANSI-C

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3. Command Line Parameters

Verify the user input and display file content

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

int main(int argc, char *argv[])
{
  FILE *fp;
  char ch;

  if(argc!=2) {
    printf("You forgot to enter the filename.\n");
    exit(1);
  }

  if((fp=fopen(argv[1], "w"))==NULL) {
    printf("Cannot open file.\n");
    exit(1);
  }

  do {
    ch = getchar();
    putc(ch, fp);
  } while (ch != '$');

  fclose(fp);

  return 0;
}

           
       

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