How to clean up the previous data in C language?

There are several ways to clean up previous data in the C language:

1. You can reset the values of variables using a loop structure, such as a for loop or while loop, to iterate through the variables that need to be reset and set them back to their initial or empty values.

for (int i = 0; i < n; i++) {
    // 清理数组或其他数据结构
    array[i] = 0;
}

1. Use the memset() function to zero out data: You can zero out data in a specified memory area using the memset() function.

#include <string.h>

memset(array, 0, sizeof(array));

1. To release dynamically allocated memory, use the free() function: If memory has been dynamically allocated using the malloc() or calloc() functions, it can be released using the free() function.

free(ptr);

It should be noted that the free() function can only release memory dynamically allocated using malloc(), calloc(), or realloc(), and not local variables on the stack. Additionally, once memory is freed, it should not be accessed again as it can lead to unpredictable errors.

If the data that needs to be cleaned is complex, consider using structure or other data structures to organize the data, and write the corresponding cleaning function to clean the data.