Thread: removing a duplicate entry

  1. #1
    Registered User
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    Jul 2010
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    removing a duplicate entry

    Hello everyone,
    I am trying to remove a duplicate entry. My problem is in the two if statements following the for loop and I for some reason cannot figure it out. I have one entry in a file that has the same department name AND course number. I am trying to get one of those removed as my instructions are to list only distinct dept/course number. My question is can someone show me what my error is and how I might go about fixing it?
    Code:
    #include "classes.h"
    
    int main(void)
    {
        int switchInput;
        int i = 0;
        int tempCourse = 0, tempCourse1 = 0;
        char caseOneInput[5];
        FILE *filePointer;
        sched_record data[MAX_RECORD];
    
        filePointer = fopen (BINFILE, "rb");
        if (filePointer == NULL) {
            printf("**Can't open file**");
            printf("**Check file permissions of file path**\n");
            exit(1);
        }
    
        printf("Enter your choice: ");
        scanf("%d", &switchInput);
    
        switch(switchInput)
        {
            case 1:
    
                fread(data, sizeof(sched_record), MAX_RECORD, filePointer);
                fclose(filePointer);
                printf("Enter Dept Name: ");
                scanf("%s", caseOneInput);
                qsort(data, MAX_RECORD, sizeof(sched_record), sortFunction);
                for (i=0; i<MAX_RECORD; i++){
                    if (!strcmp(caseOneInput, data[i].Dept)){
                        if(tempCourse != data[i].course);{
                        printf("\n%s %d", data[i].Dept, data[i].course);
                        tempCourse = data[i].course;
                        }
    
                    }
                }
        }
        return 0;
    }

  2. #2
    and the hat of int overfl Salem's Avatar
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    I would look carefully towards the end of line 33....
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  3. #3
    Registered User ledow's Avatar
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    I don't know if this is your problem or not, but the phrase:

    Code:
    !strcmp
    is nonsensical. Read up on strcmp and what it returns.

    - Compiler warnings are like "Bridge Out Ahead" warnings. DON'T just ignore them.
    - A compiler error is something SO stupid that the compiler genuinely can't carry on with its job. A compiler warning is the compiler saying "Well, that's bloody stupid but if you WANT to ignore me..." and carrying on.
    - The best debugging tool in the world is a bunch of printf()'s for everything important around the bits you think might be wrong.

  4. #4
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    Quote Originally Posted by Salem View Post
    I would look carefully towards the end of line 33....
    Dang, I thought my logic was correct. Thanks alot!

  5. #5
    Registered User
    Join Date
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    Quote Originally Posted by ledow View Post
    I don't know if this is your problem or not, but the phrase:

    Code:
    !strcmp
    is nonsensical. Read up on strcmp and what it returns.
    How about this?
    Code:
    if (strcmp(caseOneInput, data[i].Dept)==0){

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