Help again

This is a discussion on Help again within the C Programming forums, part of the General Programming Boards category; Here I have already written the code which prints the rightmost integer of a float number, however when I run ...

  1. #1
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    Feb 2011
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    Help again

    Here I have already written the code which prints the rightmost integer of a float number, however when I run the program and put in a number, the program closes immediately. Can anyone help me fix this problem?
    Code:
    #include <stdio.h>
    int main (void)
    {
        // Local Declarations
        int fltNum;
        int oneDigit;
        
        // Statements
        printf("Please enter in a float number: ");
        (float)fltNum;
        scanf("%d", &fltNum);
        
        oneDigit = fltNum % 10;
        printf("\nThe right digit is: %d", oneDigit);
        scanf("%d", &oneDigit);
        int temp;
    
        printf("Enter an integer and press Enter to exit the program: ");
    
        scanf("%d", &temp);
        
        return 0;
        
    }

  2. #2
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    Code:
    (float)fltNum;
    This statement has no effect. It doesn't magically turn fltNum into a float, just casts it, but you don't do anything with the value after casting it. Get rid of it.

    Code:
    scanf("%d", &oneDigit);
    Read the scanf documentation, I feel you are greatly misunderstanding it's use (cf you previous post). The above line scans the input stream for an integer, and stop when it finds some non-integer characters. If you type 123.45, all it grabs is 123. You then have ".45" left in the input buffer. When you do the following scanf("%d", temp), scanf skips the . and reads 45 as an int, puts it in temp and exits your program.

    Also, you can use fgets in combination with sscanf to avoid some of these problems.

  3. #3
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    I keep getting errors. The only problem is that the program closes immediately and I did remove the scanf("%d",temp)

  4. #4
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    Did you read the docs? I didn't say to remove the scanf("%d", &temp), I implied that the "%d" isn't doing what you think it's doing, i.e. it's not scanning for a float. Here's the man page for scanf, so you can understand the different format string specifiers.

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