Question

这是一个程序，假设每次调用addscore时都会创建一个数组，它会在数组的末尾添加一个数组。其余的都是自我解释的。 Scanf似乎是我的崩溃问题，虽然我不知道为什么会这样。因为我在没有使用scanf的情况下选择值2后我的程序仍然崩溃。

#include <stdio.h>
#include<stdlib.h>
#include<time.h>
int deflen;
typedef struct gamedata
{
   int score;
}gamedata;
typedef enum boolean {false,true} boolean;

int addscore(struct gamedata scoreArray[])
{
    int newscore;
    realloc(scoreArray,deflen);
    scanf("%d",scoreArray[deflen-1].score);
    return 0;
}
int printscore(struct gamedata scoreArray[])
{
    int x;
    for (x = 0; x <deflen;x++)
    {
        printf("Player%d, score:%d \n",x+1,scoreArray[x].score);
    }
    return 0;
}
int findhighest(struct gamedata scoreArray[])
{
    int x;
    int high;
    high = 0;
    for (x=0;x<deflen;x++)
    {
        if (scoreArray[x].score > high){
            high = scoreArray[x].score;
        }
        else{
            continue;
        }
    }
    return high;
}
int findavg(struct gamedata scoreArray[])
{
    int x;
    int sum=0;
    int maxLen = deflen;
    int avg = 0;
    for (x = 0; x <maxLen;x++)
    {
        sum = sum + scoreArray[x].score;
    }
    avg = sum/maxLen;
    return avg;
}
int main()
{
    boolean programEnd = false;
    deflen = 10;
    gamedata scoreArray[deflen];
    srand(time(NULL));
    for (int x = 0 ; x<deflen ;x++)
    {
        scoreArray[x].score = rand() % 20;
        printf("%d",scoreArray[x].score);
    }
    char option;

    do{
        printf("Please enter an option number: \n"); // this is pretty much what this program is suppose to do.
        printf("1.Add a score: \n");
        printf("2.Output all score: \n");
        printf("3.Find the highest score: \n");
        printf("4.Find the average score: \n");
        printf("5.End program \n");
        ///scanf("%s",&option);
        option = '2';
        printf("%s",option);
        switch(option) {
            case '1' :
                printf("1 step in");
                deflen = deflen + 1;
                addscore(scoreArray);
            break;
            case '2' :
                printf("2 step in");
                printscore(scoreArray);
            break;
            case '3' :
                printf("3 step in");
                printf("high score is  %d \n",findhighest(scoreArray));
            break;
            case '4' :
                printf("4 step in");
                printf("the average score is %d \n",findavg(scoreArray));
            break;
            case '5' :
                printf("5 step in");
                programEnd = true;
            break;
        }
    }while (programEnd == false);

    return 0;
}

Answer 1

程序应该只使用realloc（）来调整动态分配的数组！

Read this.

将数组更改为：

gamedata** scoreArray=malloc(deflen*sizeof(gamedata));

for(int i=0;i<deflen;i++)
     scoreArray[i]=malloc(sizeof(gamedata));

并且realloc需要：

   scoreArray=realloc(scoreArray,deflen)

没有编译错误但在给定输入时崩溃

1 个答案: