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<div align="center">FLASH CARDS</div>
The name says it all. This is a perfect oporutinty to practice your basic math skills, addition, subraction, multplication and division. At the end of your session (defined in length by the NUM constant) your score will be added up and you will be assigned a grade.

Flash Cards uses binary data, encoded in decimal form, to make the shapes of the form. Take the data listed in the shape array at the top of the program, write them out in binary form (1's and 0's) and stack them on top of each other to see how it works. The drawline routine is the one that decodes the data sent to it. A line variable is loaded with what each of the 6 characters per line will be. Then it looks for that numbered shape in the shape array and uses that data to output the numbers. #20 is blank, because #0 is the number 0, so that #1 can be 1 and so on. After 0-9 comes the plus sign, the minus sign, ect, two equals signs, the strike icon (for when you get an answer wrong), three icons for when you get an answer right, and finally the blank space.

For fun, change the data in the shape array and see if you can't make your own style of numbering!

/* Flash Cards
 * by Joseph Larson 2005
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#define NUM 25
 
int shape[21][9] = {
**{ 28,**54,**99,**99,**99,**99,**99,**54,**28}, 
**{ 24,**28,**30,**24,**24,**24,**24,**24, 126}, 
**{ 62,**99,**99,**48,**24,**12,** 6,** 7, 127}, 
**{127,**96, 112,**48,**56,**96,**99,**99,**62}, 
**{ 32,**48,**52,**54,**54,**51, 127,**48,**48},
**{127,** 3,** 3,** 3,**63,**96,**99,**51,**30},
**{ 56,**12,** 6,** 3,**63,**99,**99,**99,**62},
**{127,**99,**48,**48,**24,**24,**12,**12,**12},
**{ 28,**54,**54,**28,**54,**99,**99,**54,**28},
**{ 62,**99,**99,**99, 126,**96,**48,**24,**14},
**{**0,**24,**24, 126, 126,**24,**24,** 0,** 0},
**{**0,** 0,** 0, 126, 126,** 0,** 0,** 0,** 0},
**{**0,** 0, 102,**60,**24,**60, 102,** 0,** 0},
**{**0,**24,** 0, 126, 126,** 0,**24,** 0,** 0},
**{**0, 126, 126,** 0,** 0, 126, 126,** 0,** 0},
**{**0,** 0,** 0, 255, 255,** 0,** 0,** 0,** 0},
**{**0, 255, 231, 189, 153, 189, 231, 255,** 0},
**{112, 140, 146,**80, 248, 136, 136, 132,** 4},
**{**0,** 0,**12,**96,**84, 234, 246,**73,**56},
**{128, 166, 146,**61, 139,**58,** 6,** 0,** 0},
**{**0,** 0,** 0,** 0,** 0,** 0,** 0,** 0,** 0}};
char *name[21] = {"Zero", "One", "Two", "Three", "Four", "Five", "Six",
 "Seven", "Eight", "Nine", "Plus", "Minus", "Times", "Into", "Equals", "Equals",
 "Strike", "Right", "htRig", "ightR", " "};

void drawline (const int msg[6]) {
**int ch, col, row;

**for (row = 0; row < 9; row ++) {
****for (ch = 0; ch < 6; ch ++) for (col = 0; col < 8; col ++)
******putchar ((shape[msg[ch]][row] & 1 << col) ? 
******name[msg[ch]][(col + row) % strlen (name[msg[ch]])] : ' ');
****putchar ('\n');
**}
**putchar ('\n');
}

int main (void) {
**int op, max, q1, q2, ans, input, strikes, s, v, z, line[6], score[4];
**double cscore;

**srand (time (NULL)); s = 0;
**printf ("Choose an option:\n 1) Addition (easy)\n 2) Addition (hard)\n"
****" 3) Subtraction (easy)\n 4) Subtraction (hard)\n"
****" 5) Multiplication\n 6) Division\n 7) Shuffle\n ? ");
**scanf("%d", &input);
**while (input < 1 || input > 7) {
****printf ("Please type a number between 1 and 7 ? "); scanf("%d", input);
**}
**switch (input) {
****case 1 : max = 10; op = 1; break;
****case 2 : max = 99; op = 1; break;
****case 3 : max = 10; op = 2; break;
****case 4 : max = 99; op = 2; break;
****case 5 : max = 10; op = 3; break;
****case 6 : max = 10; op = 4; break;
****case 7 : max = 10; s = 1;
**}
**for (z = 0; z < 4; z++) score[z] = 0;
**for (z = 0; z < NUM; z++) {
****q1 = rand () % max; q2 = rand () % (max - 1) + 1; ans = rand () % max;
****v = (rand () < RAND_MAX / 2); 
****strikes = 0;
****if (s) op = rand () % 4 + 1;
****switch (op) {
******case 1 : ans = q1 + q2; break;
******case 2 : if (q1 < q2) {q1 ^= q2; q2 ^= q1; q1 ^= q2;}
************** ans = q1 - q2; break;
******case 3 : ans = q1 * q2; break;
******case 4 : q1 = ans * q2; ans = q1 / q2; break;
****}
****do {
******if (v) {
********line[0] = (q1 / 10) ? (q1 / 10) : 20;
********line[1] = q1 % 10;
********line[2] = 9 + op;
********line[3] = (q2 / 10) ? (q2 / 10) : 20;
********line[4] = q2 % 10;
********line[5] = 14;
********drawline (line);
******} else {
********line[0] = line[1] = line[4] = line[5] = 20;
********line[2] = (q1 / 10) ? (q1 / 10) : 20;
********line[3] = q1 % 10;
********drawline (line);
********line[0] = line[4] = line[5] = 20;
********line[1] = 9 + op;
********line[2] = (q2 / 10) ? (q2 / 10) : 20;
********line[3] = q2 % 10;
********drawline (line);
********line[0] = line[4] = line[5] = 20;
********line[1] = line[2] = line[3] = 15;
********drawline (line);
******}
******scanf("%d", &input);
******if (input != ans) {
********line[0] = line[2] = line[4] = 20;
********line[1] = (++strikes > 1) ? 16 : 20;
********line[3] = 16;
********line[5] = (strikes > 2) ? 16 : 20;
********drawline (line);
******}
****} while (input != ans && strikes < 3);
****line[0] = line[1] = line[4] = line[5] = 20;
****line[2] = (ans / 10) ? (ans / 10) : 20;;
****line[3] = ans % 10;
****drawline (line);
****if (input == ans) {
******line[0] = line[4] = line[5] = 20;
******line[1] = 17;
******line[2] = 18;
******line[3] = 19;
******drawline (line);
****}
****score[strikes] ++;
****puts ("Press any key...");
****getchar (); getchar ();
**}
**printf ("Report Card\n------ ----\n\n"
****"Out of %d:\n %d on first try (%2.1f%%)\n %d on second try (%2.1f%%)\n %d on"
****" last try (%2.1f%%)\n %d missed (%2.1f%%)\n\n",
****NUM, score[0], (float)score[0] * 100 / NUM, 
****score[1], (float)score[1] * 100 / NUM,
****score[2], (float)score[2] * 100 / NUM,
****score[3], (float)score[3] * 100 / NUM);
**cscore = (float)score[0] * 100.0 / NUM + (float)score[1] * 50.0 / NUM + 
****(float)score[2] * 25.0 / NUM;
**printf ("Grade: %c, (%2.2f%%)\n", 'A' + (cscore < 90.0) + (cscore < 80.0)
****+ (cscore < 70.0) + 2 * (cscore < 60.0), cscore);
**exit (0);
}

Be aware. This game uses a non-standard screen size. It sometimes wants more lines than an average DOS window is willing to give. If you're running it in a DOS windows and can't make it longer change the line

****v = (rand () < RAND_MAX / 2);

to

****v = 1;

I love you all, you are my people, and the list is getting shorter. We're in the home strech, so what's next?

• Reverse (order a list of number by turning them around)
• Acey Deucy (a card game of highs, lows, and middles)
• Pickup Piles (1000 games in one, set the rules and play)
• Hangman (guess the word before you dangle)
• Rotate (like those sliding block puzzles but that you rotate pieces)