c Infinite loop error

The program builds properly, but I'm getting an infinite loop of random numbers and I'm not sure why. I

int getInt(void);
double getDbl(void);
void prnTitle(void);
void prnFooter(double gTotal);
void pause(void);
double getDblLimited(double lowerLimit, double upperLimit);

comment out the main when submitting milestone one

Your final milestone one should run perfectly with the following tester program.

To comment out the main() delete the next two characters after the arrow

int main (void)
{
    int iVal;
    double dVal;
    welcome();

    // testing prnTitle()
    printf("listing header and footer with grand total:n");
    prnTitle();



    // Testing prnFooter()
    prnFooter(1234.5678);
    printf("listing header and footer without grand total:n");
    prnTitle();
    prnFooter(-1);


    // Testing Pause() and clrKyb()
    pause();


    // Testing getInt()
    printf("Enter an integer: ");
    iVal = getInt();
    printf("You entered: %dn", iVal);


    // Testing Get Int Limited
    printf("Enter an integer between 10 an 20: ");
    iVal = getIntLimited(10, 20);
    printf("Your entered %dn", iVal);


    // Testing Get Double
    printf("Enter a floating point number: ");
    dVal = getDbl();
    printf("You entered: %0.2lfn", dVal);


    // Tesing Get Double Limited
    printf("Enter a floating point number between 10.00 an 20.00: ");
    dVal = getDblLimited(10.0, 20.0);
    printf("You entered: %0.2lfn", dVal);



    printf("End of tester program for milestone one!n");
    return 0;
    }


/* End Commenting out the main out*/

// implement your functions for milestone one down here:
void welcome(void)
{
    printf("---=== Grocery Inventory System ===---n");

}

void prnTitle(void)
{
    printf("Row |SKU| Name t | Price |Taxed| Qty | Min |  Total  |Atn n");
    printf("----+---+--------------------+--------+-----+-----+-----+------------+|---n");

}
void prnFooter(double gTotal)
{
    printf("--------------------------------------------------------+-----------------n");
    //float  gTotal = 1234.57;
    while (gTotal > 0)
    {
        printf("%12.21f", gTotal);
    }
}
void clrKyb(void)
{
    char b;
    while (b != 'n')
    {
        scanf("%c", &b);
    }

}
void pause(void)
{
    printf("Press <Enter> to continue...");

    clrKyb();

}
int getInt(void)
{
    //printf("Enter an interger:");
    int d;
    char c;
    scanf("%d%c", &d, &c);
    while (c != 'n')
    {
        printf("Invalid integer, please try again ");
        scanf("%d%c", &d, &c);
    }
    return d;
}
int getIntLimited(int lowerLimit, int upperLimit)
{
    int a;
    //printf("Enter an integer between %d and %d:", lowerLimit, upperLimit);
    scanf("%d", &a);
    while (a <= lowerLimit || a >= upperLimit)
    {
    //  printf("Invalid value, %d < value < %d:", lowerLimit, upperLimit);
        scanf("%d", &a);
    }
    return a;
}
double getDbl(void)
{
    double d;
    char c;
//  printf("Enter a floating point number:");
    scanf("%lf,%c", &d, &c);
    while (c != 'n')
    {
        printf("Invalid number, please try again ");
        scanf("%lf%c", &d, &c);
    }
    return d;
}

double getDblLimited(double lowerLimit, double upperLimit)
{
    double a;
    printf("Enter a floating point number between %f and %f:", lowerLimit, upperLimit);
    scanf("%lf", &a);
    while (a <= lowerLimit || a >= upperLimit)
    {
        printf("Invalid value, %f < value < %f:", lowerLimit, upperLimit);
        scanf("%lf", &a);

    }
    return a;
    return 0;
}

---

void prnFooter(double gTotal)
{
    printf("--------------------------------------------------------+-----------------n");
    //float  gTotal = 1234.57;
    while (gTotal > 0)
    {
        printf("%12.21f", gTotal);
    }
}

You never modify the value of gTotal inside the loop. If it was greater than 0 going into the loop, it will be greater than 0 for forever, thus the infinite loop.

链接地址: http://www.djcxy.com/p/72188.html

上一篇: while循环在输入有效输入后挂起程序？

下一篇: c无限循环错误