Question

This assignment tests your ability to write C programs that handle keyboard input, formatted console output, and input/output with text files. The program also requires that you use ctype functions to deal with the logic.

In this program, you will input from the user two characters, which should both be letters where the second letter > the first letter. You will then input a file character-by-character and output those letters that fall between the two characters (inclusively) to an output file, along with all white space, digits and the punctuation marks of period and comma, but no other punctuation marks. The two letters can be input in either case, but test both upper and lower case versions when deciding whether a character is output or not. For instance, if the letters are ‘b’ and ‘p’, then anything that is >= ‘b’ and <= ‘p’ or >= ‘B’ and <= ‘P’ will be output. To ensure that the two characters are letters and the second is > first, use a data verification loop like

do {

input both characters

}while(!isalpha(first)||!isalpha(second)||second <= first);

NOTE: if you input first and second as chars, you might find an odd behavior if you have to input them a second time, or beyond. That is, if first or second is not a letter, or second <= first, re-executing the scanf in the above do-while loop causes an odd behavior. To avoid this, you can input two int values and then cast them into chars as follows:

scanf(“%d %d”, …) ;

first = (char) …;

second = (char) …;

If you use this code, you will have to input the letters using their ASCII values, such as 97 for ‘a’. You may implement this however you like, and when you run it, if you input legal chars for both first and second, you will avoid this problem.

In addition to outputting all of the characters that qualify (fall between the two input chars inclusively, is white space, digit, period or comma), count each input character, each output character, and the number of letters that were not output. After exiting the while loop, close both files and compute the difference in size between the output file and input file, or output / input * 100. Notice that output and input should be int variables, but since this is an integer division, and output < input, you need to perform a proper cast or your result will be 0 (or 0.0). Store the percentage in a double. Output a short report to the console window (using printf statements) that lists the input file name, output file name, size of input file, size of output file, number of letters not output, and percentage file change. See the example output at the bottom of the assignment.

There are two input files on the website. Download them both. Run your program on the message1.txt input file using letters ‘c’ and ‘m’. The output you should obtain is shown on the next page. Once you have this running correctly, rerun your program on the same input file using letters ‘e’ and ‘s’. Next, run the program on the second input file (message2.txt) with letters ‘b’ and ‘h’. Submit your program (commented), the console window output from the runs (first input file on ‘e’…‘s’, second input file on ‘b’…‘h’) and the two output files created (message1.txt on ‘e’ and ‘s’, message2.txt on ‘b’ and ‘h’). To obtain the console window output, obtain a screen

capture (alt+printscreen) or copy and paste the text from the console window. All five of these items (program, console output for message1.txt, output file for message1.txt, console output for message2.txt, output file for message2.txt) can be either placed in a single zip/rar file and emailed or all copied into a single text file, word document or pdf, and sent that way. Email your submission to [email protected] by 2 pm on Monday, May 20. Late assignments are excepted with a late penalty.

Input:

Enter the two letters: c m

Input file name: message1.txt

Output file name: message1out.txt

Input file size: 158

Output file size: 80

Letters not output: 74

Difference in Size: 50.6%

Created text file (message1output.txt):

Ifmi i kledge

kledge i idm,

idm i h,

h i e,

e i le,

le i mic.

MIC i he E

message1.txt input:

Information is not knowledge;
knowledge is not wisdom,
wisdom is not truth,
truth -- is not beauty,
beauty is not love,
love is not music.
MUSIC is the BEST!

message2.txt input:

Information is not knowledge;
knowledge is not wisdom,
wisdom is not truth,
truth -- is not beauty,
beauty is not love,
love is not music.
MUSIC is the BEST!

Answer 1

If you have any doubts, please give me comment...

#include<stdio.h>

#include<ctype.h>

int main(){

char ch1, ch2;

char inp_file[50], out_file[50];

printf("Enter two letters: ");

scanf("%c %c", &ch1, &ch2);

printf("Input file name: ");

scanf("%s", inp_file);

printf("Output file name: ");

scanf("%s", out_file);

FILE *fp;

fp = fopen(inp_file, "r");

if(fp==NULL){

printf("Unable to open file\n");

return -1;

}

FILE *fout;

fout = fopen(out_file, "w");

int inp_size=0, out_size=1, letters_not=0;

char line[1000], ch;

while(!feof(fp)){

fscanf(fp, "\n%[^\n]s", line);

int i=0;

while(line[i]!='\0'){

inp_size++;

ch = line[i];

if(isalpha(ch) || ch==' ' || ch==',' || ch=='\n'){

if((toupper(ch)>=toupper(ch1) && toupper(ch)<=toupper(ch2)) || ch==' ' || ch==',' || ch=='\n'){

fprintf(fout, "%c", ch);

out_size++;

}

else

letters_not++;

}

i++;

}

inp_size++;

fprintf(fout, "\n");

out_size++;

line[0] = '\0';

}

printf("Input file size: %d\n", inp_size);

printf("Output file size: %d\n", out_size);

printf("Letters not output: %d\n", letters_not);

printf("Difference in Size: %.1f%%\n", (((float)out_size/inp_size)*100));

fclose(fout);

fclose(fp);

return 0;

}