Please help me program this

Question

C++



Write a program that extracts and displays all vowels in a file. 

1. Prompt the user for the filename of a text file.
2. Read through the entire file and write every vowel to the output file. 
3. Do not write consonants or spaces to the file
4. Write all line breaks (newlines) from the input file into the output file as well. 
5. The output filename should be similar to the input file. Use the input filename and preface the name with "vowels_". 
6. For example, if the input file is named foobar.txt, the output file should be named vowels_foobar.txt
7. Do all of this with a single filestream
8. You may not process more than one line of input before writing to the output file

Answer 1

#include <stdio.h>

/* returns 1 if the character is a vowel, zero otherwise */

#define isVowel(x) ( ( ( (x)=='A') || ((x)=='a') || ((x)=='E') || ((x)=='e') || ((x)=='I') || ((x)=='i') || ((x)=='O') || ((x)=='o') || ((x)=='U') || ((x)=='u')))

void GO( int argc, char * argv[])

{

char output_filename[255];

FILE * infile = fopen(argv[1],"r");

sprintf(output_filename,"%s%s","VOWELS_",argv[1]);

FILE * outfile = fopen(output_filename,"w");

if (infile != NULL)

{

if (outfile != NULL)

{

char ch='?';

int total_vowel_count=0;

int iLineNum=1;

int iLineVowelCount=0;

while ((ch = fgetc(infile))!= EOF)

{

if (

(isVowel(ch)) || (ch=='\n')

)

{

if (ch !='\n')

{

total_vowel_count++;

iLineVowelCount++;

}

fputc(ch,outfile);

if (ch=='\n')

{

printf(" Line # %d has %d vowels \n",iLineNum++,iLineVowelCount);

iLineVowelCount=0;

}

}

else

{

fputc(' ',outfile);

}

} /* while */

printf("-----------------------------------------\n");

printf(" total # of vowels : %d \n",total_vowel_count);

}

else

{

printf(" ERROR OPENING OUTPUT FILE \n");

}

}

else

{

printf(" ERROR OPENING INPUT FILE \n");

}

fclose(infile);

fclose(outfile);

}

int main(int argc, char * argv[])

{

if (argc==1)

{

printf(" Please specify the name of the input file \n");

printf(" :> VOWELS input.dat \n");

}

else

{

GO(argc,argv);

}

}