我知道我的代码很粗糙,但程序按我的意思运行,但是我有一个退出程序的问题。我认为问题在于使用free(array)释放分配的内存。有人可以解释一下有什么问题并为这几行发布修复程序吗?
int main() {
int choice;
STUDENT *array;
int size = 0;
int counter = 0;
int i, j;
srand((unsigned)time(NULL));
printf("\n\tEnter the size for the array: \n");
scanf_s("%i", &size);
array = malloc(size, sizeof(STUDENT));
if (array == NULL) {
printf("Error Allocated Memory\n");
PAUSE;
exit(-1);
}//End If
else {
printf("The Memory Has Been Allocated\n");
PAUSE;
}//end Else
//Enter elements into the array
for (i = 0; i < size; i++) {
printf("\nPlease enter a student ID number: ");
scanf("%d", &array->stuId[i]);
//populate grades for each stuID
for (j = 0; j < size; j++) {
array->exam1[j] = rand() % 100;
array->exam2[j] = rand() % 100;
array->exam3[j] = rand() % 100;
array->exam4[j] = rand() % 100;
}
}
do {
choice = getChoice();
switch (choice) {
case 1: //Display All Student Records
studentRecords(*array, size);
break;
case 2: //Display Student Average
displayAve(array, size);
break;
case 3: //Quit
printf("\n\tThank You For Using The Program\n");
PAUSE;
break;
default:
printf("\n\tERROR-- Try Again...\n");
PAUSE;
break;
}
} while (choice != 3);
free(array);
exit(-1);
}//End Main
array = malloc(size, sizeof(STUDENT));
Malloc不带2个参数,只需要分配的字节数。两种解决方案
array = calloc(size, sizeof(STUDENT));
注意calloc将所有字节初始化为0,或者您也可以使用
array = malloc(size * sizeof(STUDENT));