试图从文件中读取一系列整数

Question

我正在编写一个练习程序来从文件中读取整数并对它们进行排序。我对 C 中的文件 IO 有点困惑。我目前所拥有的在下面，我希望有人可以看一下它并提供任何 corrections/suggestions 如果他们有...

            // TODO: Open input file and do same as above
            char *mode = "r";
            FILE *fp = fopen(inputFile, mode);

            if(fp == NULL){
                    fprintf(stderr, "Can't open input file!");
                    exit(1);
            }

            // Load the numbers into a buffer and get a count
            int buffer[100];
            int count = 0;
            while(fscanf(fp, "%d", &buffer[count]) == 1) {
                    count++;
            }


            // Initialize the array with the proper size
            integers = (int*)malloc(sizeof(count*sizeof(int)));


            // Load the integers into the array
            rewind(fp);
            for(int i = 0; i < count; i++){
                    if(fscanf(fp, "%d", &integers[count] != 1)){
                            fprintf(stderr, "Error loading integers into array");
                            exit(1);
                    }

            }

Answer 1

fscanf() returns 成功读取的元素数量因此请检查需要读取的元素数量，在您的情况下，您只需将值读取到数组并增加索引。稍后使用索引的值分配内存。

int *temp;
integers = malloc(sizeof(int)));
while(fscanf(fp, "%d", &integers[index]) == 1)
{
    index++;
    temp = realloc(integers,sizeof(int) * (index+1));
    if(temp != NULL)
    integers = temp; 
}

试图从文件中读取一系列整数

Trying to read a series of integers from a file

c

arrays

io