退出后C程序崩潰

Question

我是c編程的初學者。 所以我可能不知道很多東西。 但是誰能告訴我為什么我的代碼在最后一行完成后就崩潰了？ 難道是我定義的數組？

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


void main()
{

unsigned int totSession, totStudent;
int x, y, i, j;
int *studID,*con,*k;
char (*name1)[40];
int *frequency;

printf("Enter number of consultation\n"); //input number of consultation
scanf("%d", &totSession);
printf("Enter number of students\n"); //input number of students
scanf("%d", &totStudent);

studID = (int *)malloc(totStudent * sizeof(int));
con = (int *)malloc(totStudent * sizeof(int)); 
name1 = (char *)malloc(totStudent * sizeof(char));
frequency = (int *)malloc(totStudent * sizeof(int));
k = (int *)malloc(totSession * sizeof(int));

for (x = 0; x < totStudent; ++x) //Entering each students details
{
    printf("Enter details of Student[%d]\n", x + 1);
    printf("Enter StudentID:");
    scanf("%d", &studID[x]);
    printf("Enter student's Full name:");
    scanf("%s", &name1[x]);
    printf("Which consultation to choose for student:");
    scanf("%d", &con[x]);
}

printf("%s%15s%40s\n", "Student ID", "Fullname", "Which consultation session to choose");

for (y = 0; y < totStudent; ++y) //print all student details
{
    printf("%-17d%-23s%d\n\n", studID[y],name1[y],con[y]);
}


for (i = 0; i <= totStudent; ++i) //set all arrays of frequency to 0
{
    frequency[i]=0;
    k[i] = 0;
}

for (i = 0; i < totStudent; ++i) //summarise consultation
{
    ++frequency[con[i]];
    k[i + 1] += (i+1);           //create constant for session number
}

if (totStudent > 1)
{
    int hold, hold1;
    for (i = 0; i < totSession; ++i) //sorting
    {
        for (j = 1; j <= (totSession - 1); ++j)
        {

            if (frequency[j] < frequency[j + 1])
            {
                hold = frequency[j];
                hold1 = k[j];
                frequency[j] = frequency[j + 1];
                k[j] = k[j + 1];
                frequency[j + 1] = hold;
                k[j + 1] = hold1;
            }
        }
    }
}
printf("%s%50s", "Consultation Session Number", "The number of students choose this session\n");

for (i = 1; i <= totSession; ++i)
{
    printf("%10d%40d\n",k[i], frequency[i]);
}
printf("The session to offer is: Session %d with %d (out of %d) students chosen.\n", k[1], frequency[1], totStudent);


getch();
}

任何幫助，將不勝感激！！ 已經在代碼末尾做了free（），但是它也不起作用。

Answer 1

如果“崩潰”是指它無法編譯源，並出現以下錯誤：

/tmp/ccvGANfB.o: In function `main':
tmp.c:(.text+0x4d2): undefined reference to `getch'
collect2: error: ld returned 1 exit status

這是因為您正在嘗試使用一個不存在的函數（提取）（公平地說，它存在於curses庫中，但是我非常懷疑那是您的意思）。 您可能會錯用getchar（）。

簡而言之，在最后一行替代

 getch();

與

 getchar();

PS：“崩潰”通常是指運行時錯誤（程序在執行時失敗；您的程序無法編譯，會引發編譯時錯誤。