Question

Programming in C.

Name this program schwifty.c - This program reads a text file and makes it schwifty, but the user determines the schwiftiness. The user supplies the filename to schwift and a string containing a sequence of the following characters to determine the schwiftiness via command line arguments:

• L - Left shift each character in a word:
  • hello --> elloh
• R - Right shift each character in a word:
  • elloh --> hello
• I - Shift the letters' and digits' value "up" by one (wraps if necessary) and keeps other characters as the same:
  • a --> b
  • Y --> Z
  • 2 --> 3
  • z --> a (wrap)
  • 9 --> 0 (wrap)
  • [ --> [ (same: not letter or digit)
• D - Shift the letters' and digits' value "down" by one (wraps if necessary) and leaves other characters as the same:
  • b --> a
  • Z --> Y
  • 3 --> 2
  • a --> z (wrap)
  • 0 --> 9 (wrap)
  • [ --> [ (same - not letter or digit)

Example execution

ex.txt	./a.out ex.txt R	./a.out ex.txt D	./a.out ex.txt RD	./a.out ex.txt RDIL
Oh, yeah! You gotta get schwifty. empty line	,Oh !yeah uYo agott tge .schwifty empty line	Ng, xdzg! Xnt fnssz fds rbgvhesx. empty line	,Ng !xdzg tXn zfnss sfd .rbgvhesx empty line	Oh, yeah! You gotta get schwifty. empty line

Notes

• A word is a group of characters surrounded by whitespace.
• You can assume no word's length will be greater than 100.
• Each schwiftified word is written to stdout on a newline as shown in the examples.
• Implement the following four functions in your program that each performs the associated schwift. Your functions will be unit tested, so implement the signatures exactly as shown. A starting code template is downloadable below.
  1. void left(char word[]);
  2. void right(char word[]);
  3. void inc(char word[]);
  4. void dec(char word[]);
• Error messages:
  1. If there is not exactly 3 command line arguments, then print out the following error message: "Invalid number of arguments".
  2. If the input file cannot be opened, then print out the following error message: "Could not open file 'filename'" where filename is the name of the file (surrounded by single quotes).
  3. If one of the schwifties is invalid (not L, R, I, or D), then print out the following error message and do not print any words: "You threw off my schwiftiness with schwifty X!" where X is the leftmost invalid schwifty encountered in argv[2].
  • If errors 2. and 3. both occur at the same time, only print 2.'s error message.
    schwifty.c Welcome C schwifty.c X ... WS } Users > lucasdavis > Downloads > C schwifty.c 1 #include <stdio.h> 2 #include <string.h> 3 #include <ctype.h> 4 5 void left(char word[]); 6 void right(char word[]); 7 void inc(char word[]); 8 void dec(char word[]); 9 10 int main() { 11 12 return 0; 13 14 15 void left(char word []) { 16 17 18 19 void right(char word[]) { 20 21 22 23 void inc(char word[]) { 24 25 26 27 void dec(char word[]) { 28 29 30 } } } ⓇOAO Ln 16, Col1 Spaces: 3 UTF-8 LF с
    

Answer 1

I have included my code and screenshots in this answer. In case, there is any indentation issue due to editor, then please refer to code screenshots to avoid confusion.

-------------------schwifty.c-------------------

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

void left(char word[]); //declarations
void right(char word[]);
void inc(char word[]);
void dec(char word[]);

int main(int argc, char** argv)
{
   if (argc !=3){
       printf("Invalid number of arguments\n"); //check for number of arguments
       return 0;
   }

   FILE *fin ;
   fin = fopen(argv[1], "r") ; //file opening failed
   if(fin == NULL){
       printf("Could not open file '%s'\n", argv[1]);
       return 0;      
   }

   int i = 0;
   for(i = 0; i< strlen(argv[2]); i++){
       if(argv[2][i]!='L' && argv[2][i]!='R' && argv[2][i]!='I' && argv[2][i]!='D') { //if wrong char in input
           printf("You threw off my schwiftiness with schwifty %c!\n", argv[2][i]);
           return 0;
       }
   }

   char text[1001];
   while(fgets(text, 1000, fin)) //read line by line
   {
       char* word = strtok(text, " \n"); //split each word from the line sparated by newline or space

       while(word!=NULL) //if word is not empty
       {
           //printf("%s\n", word);
           for(i = 0; i< strlen(argv[2]); i++) //perform operations
               {
                   if(argv[2][i]=='L')
                   {
                       left(word);
                   }
                   if(argv[2][i]=='R')
                   {
                       right(word);
                   }
                   if(argv[2][i]=='I')
                   {
                       inc(word);
                   }
                   if(argv[2][i]=='D')
                   {
                       dec(word);
                   }
               }
           printf("%s\n", word); //print output for that word after all operations are completed
           word = strtok(NULL, " \n"); //find next word from the line
       }

   }

   return 0;
}

void left(char word[]) //shifts left
{
   int i;
   char output[100]; //create output array
   int out_i = 0;
   for(i = 1; i < strlen(word); i++){ //second char to last
       output[out_i++] = word[i];
   }
   output[out_i++] = word[0]; //first char
   output[out_i] = '\0'; //place null char at the end
   strcpy(word, output); //update word with output array value
}

void right(char word[])
{
   char output[100];
   int out_i = 0;
   output[out_i++] = word[strlen(word)-1]; //last char
   int i;
   for(i = 0; i < strlen(word)-1; i++){
       output[out_i++] = word[i]; //1st chat to last but one char
   }
   output[out_i] = '\0';
   strcpy(word, output);
}

void inc(char word[])
{
   char output[100];
   int out_i = 0;
   int i;
   for(i =0; i < strlen(word); i++){
       if(word[i] == 'Z') //special cases
           output[out_i++] = 'A';
       else if(word[i] == 'z')
           output[out_i++] = 'a';
       else if(word[i] == '9')
           output[out_i++] = '0';
       else if(word[i] >= 'A' && word[i] <= 'Y') //A-Y char
           output[out_i++] = word[i]+1;
       else if(word[i] >= 'a' && word[i] <= 'y') //a-y char
           output[out_i++] = word[i]+1;
       else if(word[i] >= '0' && word[i] <= '8') //0-8 char
           output[out_i++] = word[i]+1;
       else
           output[out_i++] = word[i]; //remaining chars are not altered
   }
   output[out_i] = '\0';
   strcpy(word, output);
}

void dec(char word[])
{
   char output[100];
   int out_i = 0;
   int i;
   for(i =0; i < strlen(word); i++){
       if(word[i] == 'A') //special cases
           output[out_i++] = 'Z';
       else if(word[i] == 'a')
           output[out_i++] = 'z';
       else if(word[i] == '0')
           output[out_i++] = '9';
       else if(word[i] >= 'B' && word[i] <= 'Z') //B-Y
           output[out_i++] = word[i]-1;
       else if(word[i] >= 'b' && word[i] <= 'z') //b-y
           output[out_i++] = word[i]-1;
       else if(word[i] >= '1' && word[i] <= '9') //1-9
           output[out_i++] = word[i]-1;
       else
           output[out_i++] = word[i]; //remaining chars are not altered
   }
   output[out_i] = '\0';
   strcpy(word, output);
}

-------------------Screenshot schwifty.c-------------------

-/c/schwifty/schwifty.c - Sublime Text (UNREGISTERED) 11:45 PM schwifty.c ex.txt Х #include<stdio.h> #include<stdlib.h> #include<string.h> //declarations void left(char word[]); void right(char word[]); void inc(char word[]); void dec(char word[]); { In int main(int argc, char** argv) if (argc !=3){ printf("Invalid number of arguments\n"); // check for number of arguments return 0; } FILE *fin ; fin = fopen(argv[i], "r"); //file opening failed if(fin == NULL) { printf("Could not open file '%s'\n", argv[i]); return 0; } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 int i = 0; for(i = 0; i< strlen(argv[2]); i++) { if(argv[2][i]!='L' && argv[2][i]!='R' && argv[2][i]!='I' && argv[2][i]!='0') { //if wrong char in input printf("You threw off my schwiftiness with schwifty $c!\n", argv[2][i]); return 0; } } { { char text(1001); while(fgets(text, 1000, fin)) //read line by line char* word = strtok(text, " \n"); //split each word from the line sparated by newline or space while(word!=NULL) //if word is not empty //printf("%s\n", word); for(i = 0; i< strlen(argv[2]); i++) //perform operations { if(argv[2][i]+='L') left(word); if(argv[2][i]=='R') right (word); { } { } Line 73, Column 62 Tab Size: 4 с

-/c/schwifty/schwifty.c - Sublime Text (UNREGISTERED) 11:45 PM ex.txt schwifty.c 49 50 f(argv[2][i]=='I') } 54 inc (word); if(argv[2][i]=='D') dec (word); { 58 59 60 printf("s\n", word); word = strtok (NULL, \n"); //print output for that word after all operations are completed //find next word from the line } } { } 62 63 64 65 return 0; 66 67 68 void left(char word[]) //shifts left 69 70 int i; 71 char output[100); //create output array 72 int out i = 0; 73 for(i = 1; i < strlen(word); i++){ // second char to last 74 output (out_i++] = word[i]; 75 } 76 Output (out_i++] = word[0]; //first char 77 output[out i] = '\0'; iplace null char at the end 78 strcpy(word, output); //update word with output array value 79 80 81 void right(char word[]) 82 83 char output[100]; 84 int out i = 0; 85 output (out_i++] = word[strlen(word)-1]; //last char 86 int i; 87 for(i = 0; i < strlen(word)-1; i++){ 88 output[out_i++] = word[i]; //1st chat to last but one char 89 } 90 output (out_i] = '\0'; 91 strcpy(word, output); 92 93 94 void inc(char word[]) 95 96 char output[100]; 97 int out i = 0; Line 73, Column 62 { } { Tab Size: 4

-/c/schwifty/schwifty.c - Sublime Text (UNREGISTERED) 11:45 PM ex.txt х schwifty.c int out i = 0; int i; for(i=0; i < strlen(word); i++){ if(word[i] == 'Z'). //special cases output (out_i++] = 'A'; else if(word[i] == 'z') output[out i++] = 'a'; else if(word[i] == '9') output(out_i++) 'O'; else if (word[i] >= 'A' && word[i] <= 'Y') //A-Y char output (out_i++] = word[i]+1; else if(word[i] >= 'a' && word[i] <= 'y') //a-y char output[out_i++] word[i]+1; else if(word[i] >= 'O' && word[i] <= '8') //0-8 char output (out_i++] = word[i]+1; else output (out_i++] = word[i]; //remaining chars are not altered } output[out_i] = '\0'; strcpy(word, output); } 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 void dec(char word[]) { char output[100); int out_i = ; int i; for(i =0; i < strlen(word); i++){ if(word[i] == 'A') // special cases output[out_i++] = 'Z'; else (word[i] == 'a') output (out_i++] = 'i'; else if(word[i] == '0') output[out_i++] = '9'; else (word[i] >= 'B' && word[i] <= 'Z') //B-Y output(out_i++] = word[i]-1; else if(word[i] >= 'b' && word[i] <= 'z') //b-y output (out_i++] = word[i]-1; else (word[i] >= 'l' && word[i] <= '9') //1-9 output (out_i++] = word[i]-1; else output (out_i++] = word[i]; //remaining chars are not altered output (out_i] = '\0'; strcpy(word, output); } Line 73, Column 62 Tab Size: 4

-------------------Output-------------------

-/c/schwifty/ex.txt - Sublime Text (UNREGISTERED) 11:45 PM ex.txt X schwifty.c Oh, yeah! You gotta get schwifty. 2 Line 2, Column 1 Tab Size: 4 Plain Text

ti ) 11:37 PM Ng, vs@ubuntu: -/c/schwifty vs@ubuntu:-/c/schwiftys gcc schwifty.c vs@ubuntu:-/c/schwifty$ ./a.out ex.txt R , oh ! yeah Yo agott tge .schwifty vs@ubuntu:-/c/schwifty$ ./a.out ex.txt D xdzg! Xnt fnssz fds rbgvhesx. vs@ubuntu:-/c/schwifty$ ./a.out ex.txt RD , Ng !xdzg txn zfnss sfd . rbgvhesx vs@ubuntu:-/c/schwifty$ ./a.out ex.txt RDIL on yeah! You gotta get schwifty. vs@ubuntu:-/c/schwiftys |

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