Review problems 2

Activity 72 (Substitute words in a dictionary)

You probably use special words in your daily messenger use, e.g., LOL, IG, OMG, AFAIK or use emojis for special words, e.g., 😟 for worried.

Write a program that replaces words with their corresponding expansions or emojis, e.g.,

$ echo I read your IG post and I am worried | code-wi/substitute-strings-in-dict.exe
I read your Instagram post and I am 😟

Activity 73 (Is there a bug?)

Analyze the following code snippets. Is there a bug in each code? If yes, where?

#include <stddef.h>
bool is_full;
size_t length;

int main() {
  // ...
  if (!is_full & length) {
    // ...
    ;
  }
}

#include <stddef.h>
#include <stdio.h>

enum { BREAKFAST, LUNCH, DINNER } meal;

int main() {
  // ...
  switch (meal) {
  case BREAKFAST:
    puts("Cereals");
    puts("Milk");
    break;
  case LUNCH:
  case DINNER:
    puts("Vegetables");
    puts("Beans");
  }
  // ...
}

#include <stddef.h>
#include <stdio.h>
#define LINE_SIZE 80

char *line;

int main() {
  while (fgets(line, LINE_SIZE, stdout)) {
    // ...
    ;
  }
}

    puts("yes!" ? a > b : "no!");

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

char str[] = "LEVPOS";

int main() {
  for (size_t i = 0; i < strlen(str); putc(str[i++], stdout), putc(' ', stdout))
    ;
}

Activity 74 (Guess the output)

int a = 3, b = 4;
a = b;
b = a;
printf("swapped: %d %d\n", a, b);