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    <p>The problem is with how scanf() is used. Please use this [link] to see some details. </p> <p>if you repace : scanf( " %c", theLetter ) with: scanf( " %c", &amp;theLetter ) then everything will be OK.</p> <p>Full Working Code:</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;string.h&gt; #include &lt;ctype.h&gt; // MAXWORD, which will be the max word length #define MAXWORD 20 // INCORRECT_GUESSES, which will be the max guesses #define INCORRECT_GUESSES 6 /* Prototypes */ // Fills theArray with howMany copies of theLetter void fill_array( char *theArray, int howMany, char theLetter ); // Get char from player, checks the letter, shows progress so far int get_letter( char *theWord, char *soFar ); // Check if letter is in word, updates progress so far int letter_in_word( char *theWord, char *soFar, char theLetter ); // Convert the word to lowercase void lower_string( char *someWord ); // Play one game void play( char *theWord ); /* Function definitions */ int main( ) { char theWord [ MAXWORD ]; FILE* word; word = fopen( "guesswords.txt", "r" ); if ( word == NULL ) { printf( "No input file found..........\n" ); return -1; } fscanf( word, "%s", theWord ); printf( "%s\n", theWord ); lower_string( theWord ); printf( "%s\n", theWord ); play( theWord ); fclose( word ); return 0; } // Get char from player, checks the letter, shows progress so far int get_letter( char *theWord, char *soFar ) { char theLetter; printf("\nPlease enter a letter: "); scanf( " %c", &amp;theLetter ); theLetter = tolower(theLetter); letter_in_word( theWord, soFar, theLetter ); return theLetter; } // Fills theArray with howMany copies of theLetter void fill_array( char *theArray, int howMany, char theLetter ) { int i; for( i=0; i&lt;howMany; i++ ) { theArray[i]= theLetter; *(theArray + i) = theLetter; *theArray = theLetter; } theArray[howMany] = '\0'; } // Check if letter is in word, updates progress so far int letter_in_word( char *theWord, char *soFar, char theLetter ) { int i; int num=0; int len = strlen(theWord); for( i=0; i&lt;len; i++) { if (theWord[i] == theLetter ) { soFar[i] = theLetter; num++; } } if (num == 0) { printf( "SORRY! your letter is not in the word\n" ); return 0; } else if (num&gt;0) { printf( "Congratz! your letter was in the word\n" ); printf("%s", soFar); return 1; } } // Convert the word to lowercase void lower_string( char *someWord ) { int i, cha; int len = strlen( someWord ); for( i=0; i&lt;len; i++ ) { cha = someWord[i]; cha = tolower(cha); someWord[i] = cha; } } // Play one game void play( char *theWord ) { int i; int len = strlen(theWord); int guess = INCORRECT_GUESSES; int result = 0; char soFar[MAXWORD]; fill_array( soFar, len, '*'); printf( "%c", soFar ); for( i=0; i&lt;INCORRECT_GUESSES; i++ ) { get_letter( theWord, soFar ); if( get_letter == 0) { printf( "Sorry, you're out of guesses" ); } else { printf( "You win"); } } } </code></pre>
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