c无限循环错误
该程序正确构建，但我得到一个无限循环的随机数，我不知道为什么。 一世
int getInt(void);
double getDbl(void);
void prnTitle(void);
void prnFooter(double gTotal);
void pause(void);
double getDblLimited(double lowerLimit, double upperLimit);
注释掉main（）删除箭头后面的下两个字符
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);
}
}
你永远不会修改循环内gTotal的值。 如果它大于0进入循环，它将永远大于0，因此是无限循环。