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The C Users' Group Library 1994 August
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wc-cdrom-cusersgrouplibrary-1994-08.iso
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vol_100
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140_01
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mgame.c
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1985-03-10
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/* New maths game for kids, based on an idea by Michael Mannington
By Bill Bolton,
Software Tools,
P.O. Box 80,
NSW, 2106,
AUSTRALIA
June 14, 1981 Version 1.0 (Initial Release)
*/
#include BDSCIO.H /* useful definitions etc. */
#define STDIN 0 /* CP/M console input */
#define STDOUT 1 /* CP/M console output */
#define SCALE 10 /* Maximum value of random number, change to make the
game harder as child gets older */
int odevice; /* All functions should know about I/O devices */
int idevice;
main()
{
int right; /* Number of correct answers */
int plays; /* Number of turns */
right = 0; /* Initialisation */
plays = 0;
odevice = STDOUT; /* Change for different I/O */
idevice = STDIN;
/* Set up the game */
fprintf(odevice,"\n\tSoftware Tools Presents\n");
fprintf(odevice,"\n\tLETS PLAY......NUMBERS\n\n");
srand1("Press any key to start.\n\n");
getchar(); /* Clear answer to srand1 prompt from input */
/* Play the game, always at least one turn */
do {
turn(&right,&plays);
} while(more());
/* Report results and say goodbye */
fprintf(odevice,"Thanks for playing, you got %d right from %d turns\n",
right,plays);
}
/* Gets two randomly generated numbers and asks the question, evaluates the
the answer and displays the response, checks for numeric answer */
turn(right,plays)
int *right; /* pointer to munber of right answers */
int *plays; /* pointer to number of turns */
{
int first; /* first randomly generated number */
int second; /* second ditto */
int result; /* players answer as a number */
char answer[10]; /* players answer as a string */
do {
first = rand()%SCALE; /* change SCALE in header to change */
second = rand()%SCALE; /* range of random numbers */
} while((first + second) == 0); /* eliminate 0 + 0 */
ask(first,second,answer);
while((result = atoi(answer)) == 0) { /* only accept numbers */
fprintf(odevice,"You MUST answer with a number, try again.\n\n");
ask(first,second,answer);
}
/* test answer for correctness, only two choices : right or wrong */
if(result == (first + second)) {
fprintf(odevice,"GREAT, you got it RIGHT !\n\n");
(*right)++;
}
else {
fprintf(odevice,"Sorry, the right answer was %d\n\n",
first + second);
}
(*plays)++;
}
/* Asks the question and gets the players answer as a string */
ask(first,second,answer)
int first; /* local copy of first number */
int second; /* local copy of second number */
char *answer; /* pointer to string */
{
fprintf(odevice,"What is %d + %d ",first,second);
fgets(answer,idevice);
}
/* Asks if the player wants another turn, returns 1 if Yes */
more()
{
char c;
fprintf(odevice,"Another turn ? .... type N for NO or Y for YES....");
c = getc(idevice);
fprintf(odevice,"\n\n");
return((toupper(c) == 'N') ? 0 : 1);
}