-5

我在 CS50 和继承人我的 greedy.c

#include <cs50.h>
#include <stdio.h>

int main (void) 
{
    int cents[1000];
    int used[1000];
    used = 0;
    printf("How much change is due? (Don't use symbols ex: 0.45)\n");
    scanf("%d", cents);
    if (cents < 0) {
        printf("Please use positve numbers only \n");
        scanf("%d", cents);
    };
    while (cents >= 0.25) {
        cents -= 0.25;
        used+1;
    };
    while (cents >= 0.10) {
    cents -= 0.10;
    used+1;
    };
    while (cents >= 0.05) {
    cents -= 0.05;
    used+1;
    };
    while (cents >= 0.01) {
    cents -= 0.01;
    used+1;
    };
    printf("%d", used);
}

有人可以解释为什么它不起作用吗?我不断收到此错误消息:

greedy.c:8:7: error: incompatible types when assigning to type ‘int[1000]’ from type ‘int’
  used = 0;
       ^
greedy.c:15:15: error: invalid operands to binary >= (have ‘int *’ and ‘double’)
  while (cents >= 0.25) {
               ^
greedy.c:16:9: error: invalid operands to binary - (have ‘int[1000]’ and ‘double’)
   cents -= 0.25;
         ^
greedy.c:19:15: error: invalid operands to binary >= (have ‘int *’ and ‘double’)
  while (cents >= 0.10) {
               ^
greedy.c:20:9: error: invalid operands to binary - (have ‘int[1000]’ and ‘double’)
   cents -= 0.10;
         ^
greedy.c:23:15: error: invalid operands to binary >= (have ‘int *’ and ‘double’)
  while (cents >= 0.05) {
               ^
greedy.c:24:9: error: invalid operands to binary - (have ‘int[1000]’ and ‘double’)
   cents -= 0.05;
         ^
greedy.c:27:15: error: invalid operands to binary >= (have ‘int *’ and ‘double’)
  while (cents >= 0.01) {
               ^
greedy.c:28:9: error: invalid operands to binary - (have ‘int[1000]’ and ‘double’)
   cents -= 0.01;
         ^
greedy.c:31:2: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘int *’ [-Wformat=]
  printf("%d", used);
  ^
make: *** [greedy] Error 1

编辑:好的,多亏了@Digital_Reality,我得到了编译,但现在如果我通过 1.25,我得到我们使用了 1 个硬币,如果我通过 1000.00,它说我们使用了 1000 个硬币,有人知道解决方法吗?

4

2 回答 2

1

我看到了三个问题!

1-->您已定义cents1000元素数组用作单个整数

2-->你的scanf不正确!(& 失踪)

 scanf("%d", &cents);

3--> 你的centsisint array并且你正在尝试使用 if forfloat / double.

编辑:

在这里阅读一些基础知识:http ://www.cprogramming.com/tutorial/c-tutorial.html

于 2014-01-13T05:02:34.600 回答
0

使声明的美分都用作双变量而不是数组

      double cents;
      double used;

scanf 必须传递一个地址,所以使它成为 &variable

     scanf("%lf",&cents);
于 2014-01-13T05:21:46.693 回答