c - 我的简单代码没有给出输出

Question

#include <stdio.h>
#include <conio.h>
int main(void)
{
    int year;
    float principal, amount, inrate, period, value;
    printf ("Please enter principal");
    scanf ("%f", principal);
    amount = principal;
    printf ("Please enter interest rate");
    scanf ("%f", inrate);
    year = 0;
    printf ("Please enter period");
    scanf ("%f", period);
        while(year <=  period)
            {printf ("%d %f\n", year, amount);
            value = amount + amount*inrate;
            year = year + 1;
            amount = value;
            }
        getch();
    return 0;
}

我尝试运行此代码，但根本没有输出。有 0 条警告和消息。坦率地说，我不知道代码是否能够达到预期目的而无法运行它!请帮忙。

Answer 1

I tried running this code but I have no output at all

真的吗？我收到了 6 条警告和一个段错误!你使用什么编译器？

        ||=== Build: Debug in test (compiler: GNU GCC Compiler) ===|
        main.cpp||In function 'int main()':|
        main.cpp|8|warning: format '%f' expects argument of type 'float*', but argument 2 has type 'double' [-Wformat]|
        main.cpp|11|warning: format '%f' expects argument of type 'float*', but argument 2 has type 'double' [-Wformat]|
        main.cpp|14|warning: format '%f' expects argument of type 'float*', but argument 2 has type 'double' [-Wformat]|
        main.cpp|8|warning: 'principal' is used uninitialized in this function [-Wuninitialized]|
        main.cpp|11|warning: 'inrate' is used uninitialized in this function [-Wuninitialized]|
        main.cpp|14|warning: 'period' is used uninitialized in this function [-Wuninitialized]|
        ||=== Build finished: 0 error(s), 6 warning(s) (0 minute(s), 0 second(s)) ===|

代码看起来像某种利息计算器 ( https://en.wikipedia.org/wiki/Interest )

尝试该代码:

    #include <stdio.h>
    #include <conio.h>
    int main(void)
    {
        int year;
        float principal, amount, inrate, period, value;
        printf ("Please enter principal ");
        scanf ("%f", &principal);
        amount = principal;
        printf ("Please enter interest rate ");
        scanf ("%f", &inrate);
        year = 0;
        printf ("Please enter period ");
        scanf ("%f", &period);
            while(year <=  period)
                {
                printf ("%d %f\n", year, amount);
                value = amount + amount*inrate;
                year = year + 1;
                amount = value;
                }
            getch();
        return 0;
    }