guyz..plz help me with this C program based on structures..?

Question

i m in the first yr of engg. n i need to submit this pgm this monday..so plz plz help..create a program to declare the structure for students which will store 5 records (name & roll number) and sort the records in ascending order of their roll numbers.

Answer 1

Plain C:



#include

#include

#include

#include

#include





void pause( void )

{

while( !kbhit())

;

getch();

}



struct _str

{

char name [32] ;

int rn; // roll number

};



void test_fill( _str data[], int n )

{

srand( time(0));

for( int i = 0; i < n; i++ )

{

sprintf( data[i].name, "Student # %d", i+1 );

data[i].rn = rand();

}

}



int compare_struct( const void * p1, const void * p2 )

{

const _str *s1, *s2;

s1 = (const _str*)p1;

s2 = (const _str*)p2;

if( s1->rn < s2->rn )

return -1;

if( s1->rn > s2->rn )

return 1;

return 0;

}



void print_str( _str data[], int n )

{

for( int i = 0; i < n; i++ )

printf( "%6d: %s\n", data[i].rn, data[i].name);

}



#define DATA_SIZE 6



int main( int ac, char ** av )

{

_str data[DATA_SIZE];

test_fill( data, DATA_SIZE );

printf( "Generating data:\n" );

print_str( data, DATA_SIZE );

printf( "Sorting:\n" );

qsort( &data[0], DATA_SIZE, sizeof( _str ), compare_struct );

print_str( data, DATA_SIZE );

pause();

return 0;

}

Answer 2

I won't give you full solution but some hints

1. Create a structure that will have name (stored as string) and roll number (stored as int)

2. Create a link list.

3. Inside the main program, iterate to take inputs from user name and roll number

4. Keep on adding these to new structure and add the structure to link list

5. Once user input is done

6. Iterate over the link list, and keep on getting the roll number. Store in array.

7. Write an algorithm to sort this number and get the indices in array in increasing order of roll number

8. With the indices you know in which order the structure in link list is stored. Query from link list these structures as per sorted indices and display to user.



Give it a try, you will learn something. Ready made solution wont teach you anything

Answer 3

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Answer 4

I'm not a C user. But you can use Pseudocode to plan what you want to happen in English the translate it into C.



So you'll need an input screen to get student information. You'll then need to be able to store it (and possible verify it).



A list of all stored files. If you save them in one directory you can either have a student per file or all students in one file. The first will be to use but will create more files(not a problem for small scale applications). You'll need to sort this list. The only type of sorting I remember is bubble sort, but i don't think it applies here(though it could be used).



Good luck.

Answer 5

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