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Complex programs combining sections
Posted Date: 14 Jun 2008 Resource Type: Articles/Knowledge Sharing Category: Computer & Technology
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Posted By: Lenin Member Level: Diamond
Rating:  Points: 1
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Complex programs combining sections
This example program creates and accesses a simple database.
/**********************************************************/
/* A simple Data Base Program */
/**********************************************************/
# include
# include
# include
# define MAX 100 /* constant*/
struct addr {
/*struct called list*/
char name[30] ;
char street[40] ;
char town[20] ;
char county[20] ;
char code[10] ;
} list[MAX]; /* 100 records*/
main()
{
int choice;
init_list();
for(;;) {
/* initialze the list */
choice = menu_select(); /* get user's selection*/
case 1: enter();
break;
case 2: del();
break;
/* enter a new entry */
/* delete an entry */
switch(choice) {
case 3: show_list();
break;
case 4: search();
break;
case 5: save();
break;
case 6: load();
break;
case 7: exit(0);
/* display the list */
/* find an entry */
/* save to disk */
/* read from disk */
}
}
}
/*********************************************************/
/* Function del */
/*********************************************************/
del()
{
int i;
char str[255];
inputs("enter name: " , str , 30);
i = find(str);
if (i>=0) *list[i].name = '\0' ;
else printf("not found\n") ;
}
/**********************************************************/
/* Function display */
/**********************************************************/
display(int i)
{
printf("%s\n" , list[i].name);
printf("%s\n" , list[i].street);
printf("%s\n" , list[i].town);
printf("%s\n" , list[i].county);
printf("%s\n" , list[i].code);
}
/**********************************************************/
/* Function enter */
/**********************************************************/
enter()
{
int i;
for(;;) {
i = find_free();
if(i<0) {
/* find a free structure */
printf("list full\n");
return;
inputs("enter name: ", list[i].name,30); if(!*list[i].name) break;
/* stop entering */
16 de 20
16/03/2006 12:53 p.m.
}
inputs("enter street: ", list[i].street, 40);
inputs("enter town: ", list[i].town, 20);
inputs("enter county: ", list[i].county, 20);
inputs("enter Postal code: ", list[i].code, 10);
}
}
/**********************************************************/
/* Function find */
/**********************************************************/
find(char *name)
{
int i;
for(i=0 ; iif(!strcmp(name ,list[i].name)) break;
if(i==MAX) return
else return i;
}
/**********************************************************/
/* Function find_free */
/**********************************************************/
find_free()
{
register int i;
for(i=0; iif(!*list[i].name) return i;
return
}
/**********************************************************/
/* Function init_list */
/**********************************************************/
init_list()
{
register int i;
for (i=0 ; i*list[i].name = '\0'
}
/**********************************************************/
/* Function inputs */
/**********************************************************/
inputs( char *prompt , char *s , int count)
{
char str[255];
do {
printf(prompt);
gets(str);
if(strlen(str) 1; 1; ;>=count) printf("\ntoo long\n");
} while(strlen(str)>=count);
strcpy(s , str);
}
/**********************************************************/
/* Function load */
/**********************************************************/
load()
{
FILE *fp;
if ( (fp=fopen("mlist" , "rb")) == NULL) {
printf("cannot open file\n");
return;
}
printf("\nloading file\n");
fread(list , sizeof list , 1 , fp);
if (ferror(fp))
printf("An error occurred while reading file.\n");
fclose(fp);
}
/**********************************************************/
/* Function menu_select */
/**********************************************************/
menu_select()
{
char s[80];
int c;
printf("1. Enter a name\n") ;
printf("2. Delete a name\n") ;
printf("3. List the File \n");
printf("4. Search\n") ;
printf("5. Save the file\n") ;
printf("6. Load the file\n") ;
printf("7. Quit\n")
do {
;
printf("\nEnter your choice: ");
gets(s);
c = atoi(s);
} while(c<0 || c>7);
return c;
}
/**********************************************************/
/* Function save */
/**********************************************************/
save()
{
FILE *fp;
if ( (fp=fopen("mlist" , "wb")) == NULL) {
printf("cannot open file\n");
return;
}
printf("\nsaving file\n");
fwrite(list , sizeof list , 1 , fp);
if (ferror(fp))
printf("An error occurred while writing file.\n");
fclose(fp);
}
/**********************************************************/
/* Function search */
/**********************************************************/
search()
{
int i;
char name[30];
inputs("enter name to find: " , name , 30);
if ((i=find(name))<0)
printf("not found\n");
else display(i);
}
/**********************************************************/
/* Function show_list */
/**********************************************************/
show_list()
{
int i;
for(i=0 ; iif(*list[i].name) {
display(i);
printf("\n\n");
}
}
printf("\n\n");
}
[program]
The second example program uses functions to play a simple game of tic tac
toe.
#include
#include
char matrix[3][3];
main()
{
char done;
printf("This is the game of tic tac toe...\n");
printf("You will be playing against the computer.\n") ;
done = ' ';
init_matrix();
do {
disp_matrix();
get_player_move();
done = check();
if (done != ' ') break;
get_computer_move();
done = check();
} while (done == ' ');
if (done == 'X') printf("\n\nYou won!!!\n");
else printf("I won!!!\n");
disp_matrix();
}
/**********************************************************/
/* fuction to initialise matrix */
/**********************************************************/
init_matrix()
{
int i , j ;
for (i=0 ; i<3 ; i++)
for (j=0 ; j<3 ; j++)
matrix[i][j] = ' ';
}
/**********************************************************/
/* fuction to get players move */
/**********************************************************/
get_player_move()
{
int x , y ;
printf("Enter coordinates of your X: ");
scanf("%d%d" , &x , &y);
x--; y--;
if (matrix[x][y] != ' ') {
printf("Invalid move, try again...\n");
get_player_move();
}
else matrix[x][y] = 'X';
}
/**********************************************************/
/* fuction to get computer move */
/**********************************************************/
get_computer_move()
{
int i , j ;
for (i=0 ; i<3 ; i++) {
for (j=0 ; j<3 ; j++)
if(matrix[i][j]==' ') break;
if (matrix[i][j] == ' ') break;
}
if (i*j == 9) {
printf("draw....\n");
exit(0);
}
else matrix[i][j] = 'O';
}
/**********************************************************/
/* fuction to display matrix */
/**********************************************************/
disp_matrix()
{
int t ;
printf(" 1 2 3\n");
for (t=0 ; t<3 ; t++) {
printf(" %c | %c | %c %d" , matrix[t][0],
matrix[t][1], matrix[t][2] , t+1);
if (t!=2) printf("\n---|---|---\n");
}
printf("\n");
}
/**********************************************************/
/* fuction to check matrix */
/**********************************************************/
check()
{
int i ;
for (i=0 ; i<3 ; i++)
if(matrix[i][0] == matrix[i][1] && matrix[i][0] == matrix[i][2])
return matrix[i][0];
for (i=0 ; i<3 ; i++)
if(matrix[0][i] == matrix[1][i] && matrix[0][i] == matrix[2][i])
return matrix[0][i];
if(matrix[0][0] == matrix[1][1] && matrix[1][1] == matrix[2][2])
return matrix[0][0];
if(matrix[0][2] == matrix[1][1] && matrix[1][1] == matrix[2][0])
return matrix[0][2];
return ' ';
}
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