码

Question

我有一个家庭作业，要求我为我建造的一个相信气象站获得25个随机整数（rand（））。我不知道我到目前为止所做的事情是否正确，我也不知道从哪里开始。

我不想要答案，我想了解如何将代码放在一起。我在谷歌和我的教科书中搜索过，但对我来说没有意义。我甚至不确定我是否可以在这里发布这类问题，但我想我至少会尝试。

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

int main ()
{


int get_value()
{
    int ran_num=rand()%40+60;
    return ran_num;
}

int temp_value[25];
int ran_num=0;
for (ran_num=0; ran_num<sizeof(temp_value); ran_num++)
{
    temp_value[0] = ran_num;
}
return 0;
}

Answer 1

使用printf进行一些基本格式化，即

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

  int main(void) {
    int i = 0;
    printf("c1 c2 c3 c4 c5 c6 c7 c8 c9 c0\n");
      for(i = 0; i < 10; i++) {
      printf("%0.2d %0.2d %0.2d %0.2d %0.2d %0.2d %0.2d %0.2d %0.2d %0.2d\n",
          i,  
          i + 1,  
          i + 2,  
          i + 3,
          i + 4,
          i + 5,
          i + 6,
          i + 7,
          i + 8,
          i + 9 
          );  
    }   
  }

打印

c1 c2 c3 c4 c5 c6 c7 c8 c9 c0
00 01 02 03 04 05 06 07 08 09
01 02 03 04 05 06 07 08 09 10
02 03 04 05 06 07 08 09 10 11
03 04 05 06 07 08 09 10 11 12
04 05 06 07 08 09 10 11 12 13
05 06 07 08 09 10 11 12 13 14
06 07 08 09 10 11 12 13 14 15
07 08 09 10 11 12 13 14 15 16
08 09 10 11 12 13 14 15 16 17
09 10 11 12 13 14 15 16 17 18

Answer 2

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

int main ()
{
    int temp_value[25];
    for (int i=0; i<sizeof(temp_value); i++){
        temp_value[i] = rand()%40+60;
        printf("%d \r\n", temp_value[i]);
    }
    return 0;
}

Answer 3

你应该单独写函数。
一个功能做一件事。
想想你要做什么，把目标分成小程序。

码

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

int get_value()
{
    int ran_num=rand()%40+60;
    return ran_num;
}

int main ()
{

    int temp_value[25];
    int ran_num=0;
    for (ran_num=0; ran_num<sizeof(temp_value); ran_num++) {
        temp_value[0] = ran_num;
    }
    return 0;
}

Answer 4

这是七个步骤中的修复过程。希望这会给你一些见解。这正是我为自己的代码所做的事情。

// original

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

int
main()
{

    // BUG: this is a "nested" function, which does _not_ exist in C
    int get_value() {
        int ran_num = rand() % 40 + 60;

        return ran_num;
    }

    int temp_value[25];
    int ran_num = 0;

    for (ran_num = 0; ran_num < sizeof(temp_value); ran_num++) {
        temp_value[0] = ran_num;
    }

    return 0;
}

// moved function to proper level

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

int get_value() {
    int ran_num = rand() % 40 + 60;

    return ran_num;
}

int
main()
{

    int temp_value[25];
    int ran_num = 0;

    // BUG: this _only_ sets all temp_value[0] = 0
    for (ran_num = 0; ran_num < sizeof(temp_value); ran_num++) {
        temp_value[0] = ran_num;
    }

    return 0;
}

// changed get_value variable name to make things more clear

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

int get_value() {
    int val = rand() % 40 + 60;

    return val;
}

int
main()
{

    int temp_value[25];
    int ran_num = 0;

    // BUG: this _only_ sets all temp_value[0] = 0
    for (ran_num = 0; ran_num < sizeof(temp_value); ran_num++) {
        temp_value[0] = ran_num;
    }

    return 0;
}

// changed loop to call get_value

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

// changed variable name
int get_value() {
    int val = rand() % 40 + 60;

    return val;
}

int
main()
{

    int temp_value[25];
    int ran_num = 0;

    // BUG: this _only_ sets all temp_value[0] to a random value
    for (ran_num = 0; ran_num < sizeof(temp_value); ran_num++) {
        temp_value[0] = get_value();
    }

    return 0;
}

// changed loop to set all values in array

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

// changed variable name
int get_value() {
    int val = rand() % 40 + 60;

    return val;
}

int
main()
{

    int temp_value[25];
    int ran_num = 0;

    // this sets all values, but there is still a bug ...
    // it will overflow temp_value
    for (ran_num = 0; ran_num < sizeof(temp_value); ran_num++) {
        temp_value[ran_num] = get_value();
    }

    return 0;
}

// changed loop to set all values in array but _not_ overflow

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

// changed variable name
int get_value() {
    int val = rand() % 40 + 60;

    return val;
}

int
main()
{

    int temp_value[25];
    int ran_num = 0;

    // now corrected, this sets all values to a random value
    for (ran_num = 0; ran_num < sizeof(temp_value) / sizeof(temp_value[0]);
        ran_num++) {
        temp_value[ran_num] = get_value();
    }

    return 0;
}

// final cleanup

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

// changed variable name
int get_value() {
    int val = rand() % 40 + 60;

    return val;
}

int
main()
{

    int temp_value[25];
    int temp_index;

    // now corrected, this sets all values to a random value
    for (temp_index = 0;
        temp_index < sizeof(temp_value) / sizeof(temp_value[0]);
        temp_index++) {
        temp_value[temp_index] = get_value();
    }

    return 0;
}

在C中形成数组和打印列/行

4 个答案:

码