Question

int main(int argc, const char * argv[])
{

char userInput;

int centimeter;
int meter;

float centimeterFloat = 0.0;
float meterFloat = 0.0;

printf("Enter c for centimeter to meter OR m for meter to centimeter:  ");
userInput = getchar();
//If the user types in 'm' or 'M' the progrsm will ask you to type in the length in meters and it will converts to centimeters.

if (userInput == 'M')
    userInput = 'm';
if (userInput == 'm')
{
//This calculation is to convert meters to centimeters.
    printf("\nEnter the length in meter:  ");
    scanf("%d", &meter);
    centimeterFloat
    = (meter * 100);
    printf("\nmeter\tcentimeter\n");
    printf("%d\t\t\t%4.0f\n", meter, centimeterFloat);
}
//If the user types in 'c' or 'C' the program will ask you to type in the length in centimeters and it will converts to meters.
if (userInput == 'C')
    userInput = 'c';
else if (userInput == 'c')
{
    printf("\nEnter the length in centimeter:  ");
    scanf("%d", &centimeter);
//This calculation is to convert centimeters to meters.
    meterFloat = (centimeter * 1/100);
    printf("\nmeter\tcentimeter\n");
    printf("%3.1f\t\t\t%d\n", meterFloat, centimeter);
}


return 0;
}

这是我的代码但是当我把输入作为小数时，输出没有正确输出请帮助，如果我放10cm米的结果不是小数而是0和另外一个问题，如何制作if else语句的异常处理程序？请帮帮我，非常感谢你

Answer 1

我看到的一个问题是你的if，else if结构。

//If the user types in 'c' or 'C' the program will ask you to type in the length in centimeters and it will converts to meters.
if (userInput == 'C')
    userInput = 'c';
else if (userInput == 'c'){
    printf("\nEnter the length in centimeter:  ");
    ...
}

如果用户输入'C'，程序会设置userInput，但是如果用户输入则不会进入。您可以将else更改为if。

if (userInput == 'C')
    userInput = 'c';
if (userInput == 'c'){
    printf("\nEnter the length in centimeter:  ");
    ...
}

Answer 2

变化：

meterFloat = (centimeter * 1/100);

为：

meterFloat = (centimeter * 1.0/100);

centimeter，1和100都是int s，导致整数乘法和除法。使用整数除法，centimeter/100可能为0，除非centimeter＆gt; 100。

Answer 3

更改

int centimeter;
int meter;

到

float centimeter;
float meter;

%d中的

和%f到scanf 输入为十进制，因为您将输入存储在meter和centimeter

中

C语言中的米到厘米转换程序

3 个答案: