Question

我只是学习c而且我正在做一个例外情况，我必须在1-99.99内打印10 x 4数字表，只打印大于67的数字，然后打印每行的平均值。但是我的代码不会编译，我不知道为什么。这就是我所拥有的

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 100
int main(void)
{
    int r; 
    int c;
    double num;
    double sum;
    int count;
    double avg;
    for(c = 0; c < 10; c++)
        {
            avg = 0;
            sum = 0;
            count = 0;
            for(r = 1; r< 5; r++)
                {
                    num = (float) N * rand() / (RAND_MAX + 1.0);
                if (num > 67.0) 
                    count = count + 1;
                    sum = sum + num;
                    printf("%.2f, " num);
                else 
                    printf("%4s");

               }
        if(count = 0)
        continue;
        avg = (sum\count);
        printf("%.2f |", avg);
        printf("\n\n");
      }


}

我收到以下错误

line 24 expected '<' before num 
line 25 else without a previous if statement 
line 31 stray '\' in program 
line 31 expected'>' before count

我看了看他们但我不能把它们弄清楚？

Answer 1

您需要替换avg = (sum/count);。您还应该更改为if(count == 0)。你错过了一些花括号。

建议更改：

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define N 100

int main(void)
{
    int r; 
    int c;
    double num;
    double sum;
    int count;
    double avg;
    for(c = 0; c < 10; c++)  {
       avg = 0;
       sum = 0;
       count = 0;
       for(r = 1; r< 5; r++)  {
           num = (float) N * rand() / (RAND_MAX + 1.0);
           if (num > 67.0) {
             count = count + 1;
             sum = sum + num;
             printf("%.2f, ", num);
           }
           else 
             printf("%4s");

        }
        if(count = 0)
           continue;
        avg = (sum/count);
        printf("%.2f |\n\n", avg);
      }

}

Answer 2

你需要将if身体放在花括号中：

if (num > 67.0) {
    count = count + 1;
    sum = sum + num;
    printf("%.2f, " num);
}
else {
    printf("%4s");
}

同样改变：

avg = (sum\count);

为：

avg = (sum/count);

为了比较相等，我们使用==而非=：

if(count == 0)

还用逗号分隔printf个参数：

printf("%.2f, ", num);

Answer 3

我没有运行它，但它现在编译，它需要;

1）第24行,：printf("%.2f, ", num)，

2）支持if，从第21行开始：

        if (num > 67.0) {
            count = count + 1;
            sum = sum + num;
            printf("%.2f, ", num);
        }

3）除法是/而不是\。

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 100
int main(void)
{
    int r; 
    int c;
    double num;
    double sum;
    int count;
    double avg;
    for(c = 0; c < 10; c++)
        {
            avg = 0;
            sum = 0;
            count = 0;
            for(r = 1; r< 5; r++)
                {
                    num = (float) N * rand() / (RAND_MAX + 1.0);
                if (num > 67.0) {
                    count = count + 1;
                    sum = sum + num;
                    printf("%.2f, ", num);
                }
                else 
                    printf("%4s");

               }
        if(count = 0)
        continue;
        avg = (sum/count);
        printf("%.2f |", avg);
        printf("\n\n");
      }

}

程序中的“流浪”，“否则”没有'如果'

3 个答案: