I will have a exam on the oncoming friday, my professor told us that it
will base upon this program. i am having troubles understanding this
program, for example what if i want to add all the total calories that
the user input together. determine which food has the largest calories.
how do i start to modifiy the program inorder to do the things i listed
above. thanks
#include <stdio.h>
#include <stdlib.h>
typedef struct {
char *name;
int calories;
int group;
} FOOD;
void getFood(FOOD foods[ ], int i ) {
FOOD newFood;
void *characters = malloc(81*sizeo f(char));
printf("\nPleas e enter the requested information:\n" );
printf(" for food item %d, what is\n", i+1);
printf(" the name? ");
gets( characters); // NOTE fgets IS BETTER!
newFood.name = characters;
printf(" calories/serving? ");
scanf("%d", &(newFood.calor ies));
printf(" food group? ");
scanf("%d", &(newFood.group ));
printf("\n");
foods[i] = newFood;
} // end getFood // note:a struct is and lvalue !!
void dump( FOOD foods[ ] , int n ) {
int i;
for(i=0; i<n; i++ ) {
printf("Food %d is: \n", i+1);
printf(" name : %s\n", foods[i].name);
printf(" calories: %d\n", foods[i].calories);
printf(" group # : %d\n", foods[i].group);
printf("\n");
} // end for
} // end dump
int main( ) {
int num; // number of foods entered
int i;
char dum[81];
printf("\nHow many foods will you enter? ");
scanf("%d", &num);
FOOD foods[num];
for( i=0; i<num; i++ ) {
gets(dum); //NOTE: THIS IS HERE BECAUSE OF SCANF
getFood( foods, i );
} // end for
dump( foods, num);
return 0;
} // end main 26 2217
like this:
//......
int total_calories;
int maxcalories;
char maxcaloriesname[81]
//......
total_calories= 0;
maxcalories=0;
strcpy(maxcalor iesname,"no");
//......
FOOD foods[num];
for( i=0; i<num; i++ ) {
getFood( foods, i );
// .......
total_calories+ =foods[i].calories;
if(foods[i].calories>maxca lories)
{
maxcalories=foo ds[i].calories;
strcpy(maxcalor iesname,foods[i].name);
}
} // end for
//.....
Bail wrote: I will have a exam on the oncoming friday, my professor told us that it will base upon this program.
I had whipped up some code, which works, and pasted it only to
discover, its
thursday!
i am having troubles understanding this program, for example what if i want to add all the total calories that the user input together. determine which food has the largest calories. how do i start to modifiy the program inorder to do the things i listed above. thanks
[just too many things I felt i had to comment on so ... ]
1. Don't use gets. Its dangerous. GIYF.
2. Interactive input with scanf is tricky stuff. Search the archive,
with something
like "scanf + string + input + pete ". (pete happens to post some
code I really like)
3. Learn about qsort(). Here's some hint: you will need something like
....
int calcmp( const void *l, const void *r )
{
const FOOD *left = l;
const FOOD *right = r;
if ( left->calories > right->calories )
return 1;
/* fill in the blanks ... */
}
4. You said you're having trouble. Presumably, not with the code you
pasted.
If you understand the code you pasted, the homework should be easy
:)
See ya' on friday.
Suman wrote: 2. Interactive input with scanf is tricky stuff. Search the archive, with something like "scanf + string + input + pete ". (pete happens to post some code I really like)
That way of using scanf, was primarily promoted by Dan Pop.
Dan Pop tended to be very accuarate, but was ...
If I were to say that he had an abrasive personality,
it would not surprise me in the least,
if he were to reply with a logical rebuttal
of how his personality was not abrasive
and how I must be mentally deficient
for even thinking something like that.
--
pete
pete wrote:
[...my ignorance snipped] That way of using scanf, was primarily promoted by Dan Pop. Dan Pop tended to be very accuarate, but was ...
Hmm. Appears that I just found much the same. But of course,
post-posting.
If I were to say that he had an abrasive personality, it would not surprise me in the least, if he were to reply with a logical rebuttal of how his personality was not abrasive and how I must be mentally deficient for even thinking something like that.
And I thought I'm the only Ogden Nash fan 'round here.
huh? i dont get where to put this code into my program to make it work?
pete wrote: Suman wrote:
2. Interactive input with scanf is tricky stuff. Search the archive, with something like "scanf + string + input + pete ". (pete happens to post some code I really like)
That way of using scanf, was primarily promoted by Dan Pop. Dan Pop tended to be very accuarate, but was ...
<snip very accurate description> :-)
Indeed...What ever happened to Dan?
Come on some one help me out here.... dont get this stuffs.
thanks for the info. is there any more ??? help a poor student here This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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