Help with Sorting Structures in Database

This is a discussion on Help with Sorting Structures in Database within the C Programming forums, part of the General Programming Boards category; You have done plenty! Thank you so much, I actually just fixed it i<cnt-2 and j<cnt-1 is the correct way ...

  1. #16
    Registered User
    Join Date
    Nov 2012
    Posts
    9
    You have done plenty! Thank you so much, I actually just fixed it i<cnt-2 and j<cnt-1 is the correct way to do it. Ill post the completed code.
    Code:
    #include <string.h>
    #include <stdio.h>
    struct student
    {
        int student_id;
        char name[30];
        char grade[15];
    };
    void sort(struct student st[],int cnt,int choice); 
    int main(void)
    {
    	int i;
    	int students;
    	int input;
    	struct student stu[20];
        printf("How many students in the Class?: ");
        scanf("%d", &students);
        for(i = 0; i < students; i++)
     
     
        {
            printf("Enter name: ");
            scanf("%s",stu[i].name);
            printf("Enter id: ");
            scanf("%d", &stu[i].student_id);
            printf("Enter grade: ");
            scanf("%s",stu[i].grade);
            printf("\n");
        }
     
        printf("how do you want to sort the records? [0 - name, 1 - id, 2 - grade]: ");
        scanf("%d", &input);
    
        sort(stu,students,input);
    
            for(i = 0; i < students; i++) 
              {           
             printf(" %s, ID: %d, has a grade: %s\n\n", 
                stu[i].name,stu[i].student_id,stu[i].grade); 
              }
    
        return 0;
     }
     
        void sort(struct student st[],int cnt,int choice)
        {
            int i,j;
            struct student temp;
     
     
            for(i=0;i<cnt-2;i++)
            {
                for(j=0;j<cnt-1;j++)
                {
                    if(
                            (choice==0 && strcmp(st[j].name,st[j+1].name)>0)
                            ||
                            (choice==1 && st[j].student_id>st[j+1].student_id)
                            ||
                            (choice==2 && st[j].grade>st[j+1].grade)
                      )
        
                    {
                        temp=st[j];
                        st[j]=st[j+1];
                        st[j+1]=temp;
                    }
    
                }
            }
        }

  2. #17
    Registered User
    Join Date
    Nov 2010
    Location
    Long Beach, CA
    Posts
    5,496
    That doesn't work. It has the same problem I mentioned in post #13. Here's what happens when I run the latest code you gave:
    Code:
    $ ./stud
    How many students in the Class?: 5
    Enter name: sarah
    Enter id: 53214
    Enter grade: a
    
    
    Enter name: jack
    Enter id: 54673
    Enter grade: b
    
    
    Enter name: daniel
    Enter id: 61234
    Enter grade: b
    
    
    Enter name: monica
    Enter id: 71234
    Enter grade: c
    
    
    Enter name: chris
    Enter id: 64351
    Enter grade: f
    
    
    how do you want to sort the records? [0 - name, 1 - id, 2 - grade]: 0
     daniel, ID: 61234, has a grade: b
    
    
     chris, ID: 64351, has a grade: f
    
    
     jack, ID: 54673, has a grade: b
    
    
     monica, ID: 71234, has a grade: c
    
    
     sarah, ID: 53214, has a grade: a
    daniel should NOT come before chris. i<cnt-2 is wrong, there aren't enough iterations to bubble all the records up to their correct place, you need one more iteration, i<cnt-1.

    Unfortunately, you deleted your post that described the other problem you were having (something about the last record not being sorted?). Please use i<cnt-1, then show the input you gave and output you got that was incorrect, so we can help you troubleshoot whatever problem that was.

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