Simple Data Base Program Using C-programming language to insert, Delete, and Search Record

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/* A simple Data Base Program */






/**********************************************************/



# include <stdio.h>

# include <stdlib.h>

# include <string.h>

# 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(); /* initialze the list */

for (;;) {

choice = menu_select(); /* get user's selection*/ switch (choice) {

case 1: enter(); /* enter a new entry */

break;

case 2: del(); /* delete an entry */

break;

case 3: show_list(); /* display the list */

break;

case 4: search(); /* find an entry */

break;

case 5: save(); /* save to disk */

break;

case 6: load(); /* read from disk */

break;

case 7: exit(0);



}

}

}

/*********************************************************/






/* 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");



}

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/* Function display */






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display(int i)



{

printf("\n1.Name: %s\n", list[i].name);

printf("\n2.Street:%s\n", list[i].street);

printf("\n3.Town:%s\n", list[i].town);

printf("\n4.Country:%s\n", list[i].county);

printf("\n5.Code:%s\n", list[i].code);



}

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/* Function enter */






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enter()

{

int i;







i = find_free(); /* find a free structure */

if (i < 0) {

printf("list full\n");

return;



}

inputs("enter name: ", list[i].name, 30);

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);



}

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/* Function find */






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find(char *name)



{

int i;

for (i = 0; i<MAX; i++)

if (!strcmp(name, list[i].name)) break;

if (i == MAX)

return;

else

return i;



}

/**********************************************************/






/* Function find_free */






/**********************************************************/





find_free()

{

register int i;

for (i = 0; i<MAX; i++)

if (!*list[i].name) return i;

return;



}

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/* Function init_list */






/**********************************************************/





init_list()

{

register int i;

for (i = 0; i < MAX; i++)

*list[i].name = '\0';



}

/**********************************************************/






/* Function inputs */






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inputs(char *prompt, char *s, int count)



{

char str[255];

do {

printf(prompt);



gets(str);

if (strlen(str) >= 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);

printf("\nfile loaded\n");



}

/**********************************************************/






/* Function menu_select */






/**********************************************************/





menu_select()

{

char s[80];

int c;

printf("\n-------------------------------------------------------------------------\n\n");

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");

printf("\n\n-------------------------------------------------------------------------\n\n");



　

do {

printf("\nEnter your choice: ");



gets(s);

c = atoi(s);

} while (c<0 || c>7);

return c;



}

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/* Function save */






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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);

printf("\nfile saved\n");



}

/**********************************************************/






/* 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, exist=0;

for (i = 0; i<MAX; i++) {

if (*list[i].name) {



display(i);

exist = 1;

printf("\n\n");



}

}

if(exist==0)

printf("\nfile not found");

printf("\n\n");



}


Out Put