Find words in the list that start with q but not qu DSM 20

Solution

1)

program1.c

#include <stdio.h>
#include <stdlib.h> // For perror and exit
#include <string.h>

//*** Tests a word ***//
//
// It\'s helpful to put complex tests in their own functions, rather than
// in the basic file-reading loop.
int checkVowelsAndY(char *word) {
    int i;
   for(i=0;i<word.length();i++){
       if(word[i] == \'a\' || word[i] == \'e\' || word[i] == \'i\' || word[i] == \'o\' || word[i] == \'u\' || word[i] == \'y\'){
           return 0;
       }
   }
   return 1;
}

//*** Reads and tests every word in the list ***//
void readWordList() {
    FILE *f = fopen(\"words.txt\", \"r\");
    if (f == NULL) {
        perror(\"fopen\");
        exit(1);
    }
  
    char buf[64];
  
    while (fgets(buf, sizeof(buf), f) != NULL) {
        buf[strlen(buf) - 1] = \'\\0\'; // Strip terminating newline
      
        if (checkVowelsAndY(buf)) {
            printf(\"%s\ \", buf);
        }
    }
  
    fclose(f);
  
    return;
}

int main() {
    readWordList();
    return 0;
}

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2)

problem2.c

#include <stdio.h>
#include <stdlib.h> // For perror and exit
#include <string.h>

//*** Tests a word ***//
//
// It\'s helpful to put complex tests in their own functions, rather than
// in the basic file-reading loop.
int checkDoublePairs(char *word) {
    int i,count=0;
   if(word.length() >= 6){
      
       for(i=0;i<word.length()-1;i++){
           if(word[i] == word[i+1]){
               count++;
           }
       }
       if(count >= 3){
           return 1;
       }
   }
   return 0;
}

//*** Reads and tests every word in the list ***//
void readWordList() {
    FILE *f = fopen(\"words.txt\", \"r\");
    if (f == NULL) {
        perror(\"fopen\");
        exit(1);
    }
  
    char buf[64];
  
    while (fgets(buf, sizeof(buf), f) != NULL) {
        buf[strlen(buf) - 1] = \'\\0\'; // Strip terminating newline
      
        if (checkDoublePairs(buf)) {
            printf(\"%s\ \", buf);
        }
    }
  
    fclose(f);
  
    return;
}

int main() {
    readWordList();
    return 0;
}

--------------------------------------------------------------------------------------------------------------------------------------------------------------------

3)

problem3.c

#include <stdio.h>
#include <stdlib.h> // For perror and exit
#include <string.h>

//*** Tests a word ***//
//
// It\'s helpful to put complex tests in their own functions, rather than
// in the basic file-reading loop.
int checkPalindrome(char *word) {
    if(strrev(word) == word){
       return 1;
   }
   return 0;
}

//*** Reads and tests every word in the list ***//
void readWordList() {
    FILE *f = fopen(\"words.txt\", \"r\");
    if (f == NULL) {
        perror(\"fopen\");
        exit(1);
    }
  
    char buf[64];
  
    while (fgets(buf, sizeof(buf), f) != NULL) {
        buf[strlen(buf) - 1] = \'\\0\'; // Strip terminating newline
      
        if (checkPalindrome(buf)) {
            printf(\"%s\ \", buf);
        }
    }
  
    fclose(f);
  
    return;
}

int main() {
    readWordList();
    return 0;
}

-----------------------------------------------------------------------------------------------------------------------------------------------------------

(4)

problem4.c

#include <stdio.h>
#include <stdlib.h> // For perror and exit
#include <string.h>

//*** Tests a word ***//
//
// It\'s helpful to put complex tests in their own functions, rather than
// in the basic file-reading loop.
int checkUniqueLetters(char *word) {
    int chars[word.length()];
   int i,res = 0,index = 0;
   for(i=0;i<word.length();i++){
       res = 0;
       for(j=0;j<index;j++){
           if(word[i] == chars[j]){
               res = 1;
           }
       }
       if(res == 0){
           chars[index] = word[i];
           index++;
       }
   }
   return index;
}

//*** Reads and tests every word in the list ***//
void readWordList() {
    FILE *f = fopen(\"words.txt\", \"r\");
    if (f == NULL) {
        perror(\"fopen\");
        exit(1);
    }
  
    char buf[64];
   char maxword[64];
   int max = 0;
  
    while (fgets(buf, sizeof(buf), f) != NULL) {
        buf[strlen(buf) - 1] = \'\\0\'; // Strip terminating newline
        if(checkUniqueLetters(buf) > max){
           max = checkUniqueLetters(buf);
           maxword = buf;
       }
    }
    printf(\"%s\",maxword);
    fclose(f);
  
    return;
}

int main() {
    readWordList();
    return 0;
}