求大佬帮忙写一个简单的程序,C\C++交流,技术交流,鱼C论坛

saberAMD 发表于 2018-11-28 21:56:26

求大佬帮忙写一个简单的程序

才学到数组，被这个难住了，

TakeOver5 发表于 2018-11-29 06:21:30

这个问题可以通过二维数组解决

#include <stdio.h>

int main(void){

int course = 3;       // 課程門數
int student_count;    // 學生人數
int i,j;

printf("輸入學生人數：");
scanf("%d", &student_count);

int grade;
int student_total_score = {0};
int course_total_score = {0};

for(i=0; i<student_count; i++){
   printf("學生編號 %02d 的 %d 個成績輸入(空白分隔):", i+1, course);
   for(j=0; j<course; j++){
         scanf("%d", &grade);
         /* 當前學生的總分 */
         student_total_score += grade;

         /* 每門課程的總分 */
         course_total_score += grade;
   }
}

printf("\n**********課程成績**********\n");

printf("總分：");
for(i=0; i<course; i++)
   printf("%d\t", course_total_score);

printf("\n");

printf("平均：");
for(i=0; i<course; i++)
   printf("%.1f\t", float(course_total_score) / student_count);

printf("\n**********個人成績**********\n");

/* 打印所有學生的分數、總分和平均分 */
for(i=0; i<student_count; i++){
   printf("學生編號 %02d:\t", i+1);
   for(j=0; j<course; j++){
         printf("%d\t", grade);
   }
   printf("%d\t", student_total_score);
   printf("%.1f\t", float(student_total_score) / course);
   printf("\n");
}
}

saberAMD 发表于 2018-11-29 09:19:01

TakeOver5 发表于 2018-11-29 06:21
这个问题可以通过二维数组解决

scanf("%d", &student_count);

int grade;
int student_total_score = {0};
int course_total_score = {0};
这里是错的，不能动态定义数组

TakeOver5 发表于 2018-11-29 16:35:08

saberAMD 发表于 2018-11-29 09:19
scanf("%d", &student_count);

int grade;

抱歉我这里使用 C++ 编译，没注意到这个问题

想都不要想 发表于 2018-11-29 19:13:21

#include "stdio.h"

#define student_num 200 //最多可以输入200人

int main()
{
int student;
int i, student_now;
int Total_score;
int student_score = {0};
float student_total_score = {0}, average = {0, 0, 0};

scanf("请输入：%d", &student_now);

for(i = 0; i < student_now; i++)
{
printf("请输入第%d的3门成绩:\r\n", i+1);
scanf("%d, %d, %d", &student, &student, &student);
}

for(i= 0; i< student_now; i++)
{
Total_score += student;
Total_score += student;
Total_score += student;

student_score += student + student + student;
student_total_score = (float)student_score / 3;
}

average = (float)Total_score/student_now;
average = (float)Total_score/student_now;
average = (float)Total_score/student_now;

for(i= 0 ; i< student_now; i++)
{
printf("第%d位同学的总分是:%d \r\n", i+1, student_score);
printf("第%d位同学的平均分是:%f \r\n", i+1, student_total_score);
printf("全班的总分是:%d, %d, %d \r\n", Total_score, Total_score, Total_score);
printf("全班的平均分是:%f, %f, %f \r\n", average, average, average);
}

return 0;

}

TakeOver5 发表于 2018-11-30 03:54:44

本帖最后由 TakeOver5 于 2018-11-30 04:28 编辑

上方已经解决这个问题了，不过有几个小 Bug 稍微除错一下

#include "stdio.h"

#define student_num 200             //最多可以输入200人

int main()
{
   int student;
   int i, student_now;
   int Total_score = {0};
   int student_score = {0};
   float student_total_score = {0}, average = {0, 0, 0};

   printf("请输入：");
   scanf("%d", &student_now);

   for(i = 0; i < student_now; i++)
   {
            printf("请输入第%d的3门成绩:", i+1);
            scanf("%d, %d, %d", &student, &student, &student);
   }

   for(i= 0; i< student_now; i++)
   {
            Total_score += student;
            Total_score += student;
            Total_score += student;

            student_score += student + student + student;
            student_total_score = (float)student_score / 3;
   }

   average = (float)Total_score/student_now;
   average = (float)Total_score/student_now;
   average = (float)Total_score/student_now;

   for(i= 0 ; i< student_now; i++)
   {
            printf("第%d位同学的总分是:%d \r\n", i+1, student_score);
            printf("第%d位同学的平均分是:%f \r\n", i+1, student_total_score);
   }

   printf("全班的总分是:%d, %d, %d \r\n", Total_score, Total_score, Total_score);
   printf("全班的平均分是:%f, %f, %f \r\n", average, average, average);

   return 0;

}

不过若想在 C 语言完成动态数组，那么可以使用 malloc() 函数实现

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

int main(void){

int course = 3;       // 課程門數
int student_count;    // 學生人數
int i,j;

printf("輸入學生人數：");
scanf("%d", &student_count);

int **grade, *data;
int *student_total_score, *course_total_score;

//int grade;
grade = (int**)malloc(student_count*sizeof(int*) + student_count*course*sizeof(int));
data = (int*)grade+student_count;
for(i=0; i<student_count; i++, data+=course)
   grade = data;

//int student_total_score = {0};
student_total_score = (int*)malloc(student_count*sizeof(int));
for(i=0; i<student_count; i++)
   student_total_score = 0;

//int course_total_score = {0};
course_total_score = (int*)malloc(course*sizeof(int));
for(i=0; i<course; i++)
   course_total_score = 0;

for(i=0; i<student_count; i++){
   printf("學生編號 %02d 的 %d 個成績輸入(空白分隔):", i+1, course);
   for(j=0; j<course; j++){
         scanf("%d", &grade);
         /* 當前學生的總分 */
         student_total_score += grade;

         /* 每門課程的總分 */
         course_total_score += grade;
   }
}

printf("\n**********課程成績**********\n");

printf("總分：");
for(i=0; i<course; i++)
   printf("%d\t", course_total_score);

printf("\n");

printf("平均：");
for(i=0; i<course; i++)
   printf("%.1f\t", (float)course_total_score / student_count);

printf("\n**********個人成績**********\n");

/* 打印所有學生的分數、總分和平均分 */
for(i=0; i<student_count; i++){
   printf("學生編號 %02d:\t", i+1);
   for(j=0; j<course; j++){
         printf("%d\t", grade);
   }
   printf("%d\t", student_total_score);
   printf("%.1f\t", (float)student_total_score / course);
   printf("\n");
}

free(grade);
free(student_total_score);
free(course_total_score);

return 0;
}

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求大佬帮忙写一个简单的程序