C 编程打印大负数

Question

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已关闭 10 年前。

我是编程新手，但我正在学习编程类(class)以开始介绍它。问题是他们不教我们，他们只是给我们做事。我们需要创建函数来根据一个人拥有的硬币和美元数量(通过用户输入)来计算某人拥有的美分数量。我不知道我在做什么，或者我是否正确使用了函数原型(prototype)，但是当我运行我的程序时，我没有收到任何错误，但它只是打印一个大负数。这就是我所拥有的，我知道很抱歉，但非常感谢任何帮助。

#include <stdio.h>
#include <stdlib.h>
#include </home/TU/tue64800/include/myheader.h>

#define PENNYCOIN      1
#define NICKELCOIN     5
#define DIMECOIN      10
#define QUARTERCOIN   25
#define HALFCOIN      50
#define DOLLAR       100

int penny_coin_worth( int number_of_pennies );  
int nickel_coin_worth( int number_of_nickels );
int dime_coin_worth( int number_of_dimes );
int quarter_coin_worth( int number_of_quarters );                  
int half_coin_worth( int number_of_half );             
int dollar_coin_worth( int number_of_dollars );            
int total_worth ( int number_of_pennies, int number_of_nickels, int number_of_dimes,
int number_of_quarters, int number_of_half, int number_of_dollars );

int number_of_pennies, number_of_nickels, number_of_dimes, number_of_quarters,
number_of_half, number_of_dollars;
int total;

int main (void)
{
printf( "This program was written by %s.\n", PROGRAMMER_NAME );

printf( "Enter number of pennies:\n");
scanf( "%lf", &number_of_pennies);

printf( "Enter number of nickels:\n");
scanf( "%lf", &number_of_nickels);

printf( "Enter number of dimes:\n");
scanf( "%lf", &number_of_dimes);

printf( "Enter number of quarters:\n");
scanf( "%lf", &number_of_quarters);

printf( "Enter number of half dollars:\n");
scanf( "%lf", &number_of_half);

printf( "Enter number of dollars:\n");
scanf( "%lf", &number_of_dollars);

penny_coin_worth (number_of_pennies);
nickel_coin_worth (number_of_nickels);
dime_coin_worth (number_of_dimes);
quarter_coin_worth (number_of_quarters);
half_coin_worth (number_of_half);
dollar_coin_worth (number_of_dollars);

total_worth ( number_of_pennies, number_of_nickels, number_of_dimes,   
number_of_quarters, number_of_half, number_of_dollars );

return EXIT_SUCCESS;
}

int penny_coin_worth (int number_of_pennies)
{
    return ( number_of_pennies * PENNYCOIN);
}

int nickel_coin_worth (int number_of_nickels)
{
    return ( number_of_nickels * NICKELCOIN);
}

int dime_coin_worth (int number_of_dimes)
{
    return ( number_of_dimes * DIMECOIN);
}

int quarter_coin_worth (int number_of_quarters)
{
    return ( number_of_quarters * QUARTERCOIN);
}

int half_coin_worth (int number_of_half)
{
    return ( number_of_half * HALFCOIN );
}

int dollar_coin_worth (int number_of_dollars)
{
    return ( number_of_dollars * DOLLAR);
}

int total_worth ( int number_of_pennies, int number_of_nickels, int number_of_dimes,  
int number_of_quarters, int number_of_half, int number_of_dollars)
{
printf("The number of cents is%lf\n", (number_of_pennies * PENNYCOIN +    
number_of_nickels *  NICKELCOIN + number_of_dimes * DIMECOIN + number_of_quarters *  
QUARTERCOIN +  number_of_half * HALFCOIN + number_of_dollars * DOLLAR)*.01);
    return (0);
}

Answer 1

阅读printf Format Specifiers 。正如 Guy Sirton 所说，您的错误是使用 %lf 读取 int (在 scanf 中)，而这些是不同的类型。您应该使用 %d 来表示 int。

将来，您应该学习如何使用 GDB 等调试器，并使用它来单步执行程序，并检查变量的值。