hangman.c

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

int main (int argc, char *argv[]) {
  if (argc < 2) {
    fprintf(stderr, "Usage: %s word\n", argv[0]);
    return 1;
  }
  char *const wordArg = argv[1];
  int const wordLen = strlen(wordArg);

  char *word = calloc(wordLen + 1, sizeof(char));
  strncpy(word, wordArg, wordLen);

  char *underscores = calloc(wordLen + 1, sizeof(char));
  for (int i = 0; i < wordLen; i++) {
    underscores[i] = '_';
  }
  underscores[wordLen] = '\0';

  printf("Welcome to hangman!\n");

  int const maxGuesses = 10;
  int swaps = 0;
  
  for (int guess = 0; guess < maxGuesses; guess++) {
    printf("%s\n", underscores);
    printf("Enter a character: ");

    char guess;
    scanf("%c", &guess);
    fpurge(stdin);

    bool swapped = false;
    
    for (int i = 0; i < wordLen; i++) {
      if (word[i] == guess) {
        char temp = underscores[i];
        underscores[i] = word[i];
        word[i] = temp;
        swaps++;
        swapped = true;
      }
    }

    if (!swapped) {
      printf("Nope! Try again.\n");
    } else if (swaps == wordLen) {
      break;
    }
  }

  if (swaps == wordLen) {
    printf("You won!\n");
  } else {
    printf("You lost!\n");
  }
  
  return 0;
}