Float is reading 0 regardless of input

This is a discussion on Float is reading 0 regardless of input within the C Programming forums, part of the General Programming Boards category; With the below program, whenever I enter an amount for bookcost, it reads 0. I've tried a few different things ...

  1. #1
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    Float is reading 0 regardless of input

    With the below program, whenever I enter an amount for bookcost, it reads 0. I've tried a few different things but I cannot seem to get it to use my input.
    Around line 49 is where I ask for user input.
    Any thoughts would be aweosme.


    Code:
    //Tschippert
    //September 21st-22nd, 2012
    
    #include <stdio.h>
    
    int main ()
    {
        // Defining Integers//
        //
        
        int bookproduct;
        int bookcount;
        float bookcost;
        float bookcost2;
        
        int totalbookcount;
        float totalcost;
        
        unsigned int counter;
        unsigned int looprun;
    
        
       
        // Initializing Integers//
        //
        
        counter=0;
        totalbookcount=0;
        totalcost=0;
        bookcount=0;
        
        //Begininng Loop//
        //
        
        printf("Would you like to enter a book? 1 for yes, 2 for no.");
        scanf(" %d", &looprun);
        
        while (looprun !=2) {
        
        counter++;
        
        printf("\nEnter the Book Product Number:\n");
        scanf(" %d", &bookproduct);
        
        printf("\nEnter the Number of Books Purchased: (Negative if you are returning)\n");  
        scanf(" %d", &bookcount);
        
        printf("\nEnter the Cost of the Book Purchased:\n");
        scanf(" %.2f", &bookcost);
        while(getchar() != '\n');                                                                           //Fix for input stream//
        
        bookcost2= (float) bookcost*bookcount;
        
        printf("\nYou entered %d of product %d for %.2f.\n", bookcount, bookproduct, bookcost2);            //Displays what was entered//
        printf("\nWould you like to add another book? 1 for yes, 2 for no.\n");                             //Asks if user wants to continue//
        scanf(" %d", &looprun);                                                                             //Changes value of looprun to with continue the loop or end the loop//
        
        totalbookcount = totalbookcount+bookcount;                                                          //Sums up the entered information for a final display.//
        totalcost = (float) (totalcost+bookcost2);
             
    
        
           
        }
        
        if (counter>0) {
                        
        printf("\nNumber of records entered: %d", counter);
        printf("\nTotal Number of Books: %d", totalbookcount);
        printf("\nTotal Cost of Books: %.2f", totalcost);
             
        }
        
        else {
             
        printf("You did not enter any books!");
        
        }
           
        
        
        //Totaling inputed values//
        //
        
    
        //Reiterating entered information//
        //
        
        
        //Counter for number of runs
        
    }

  2. #2
    SAMARAS std10093's Avatar
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    I would switch this
    Code:
     scanf(" %.2f", &bookcost);
    into this
    Code:
     scanf(" %f", &bookcost);

  3. #3
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    Works! Thanks,

    I was looking at that but never thought about removing it for fear of someone entering more than two decimals. However, only the output needs to be truncated correct?

  4. #4
    Registered User whiteflags's Avatar
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    Quote Originally Posted by MTSchippert View Post
    Works! Thanks,

    I was looking at that but never thought about removing it for fear of someone entering more than two decimals. However, only the output needs to be truncated correct?
    That is correct. If you want to be stringent about input for whatever reason, you should convert a string that is valid (such as "1.00") to a float, and reject the string otherwise. Precision is for output only.

  5. #5
    SAMARAS std10093's Avatar
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    Well i am not sure if understood the question(maybe my English are not good enough).Or say it in other words,or give me an example or wait for the other users to answer .

    Also,welcome to the forum

    EDIT->already answered

  6. #6
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    Thanks. I will probably be using it often haha.

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