我想从用户(控制台)读取数据。用户可以给出的示例数据:
0 : [ 83, 42, 7 ]
21:[3, 6, 8, 12, 9, 3, 6, 8, 12]
63 : [ 8, 12, 9, 3, 6, 8 ]
0 : [ 20, 31, 70 ]
输入以EOF结束。
我不知道整数数组有多长([]里面的数组)以及有多少行数据。我想用数字保存数组(括号中的整数 - []),这是该行的第一个数字。
编写动态数组不是问题:
typedef struct {
int *array;
size_t used;
size_t size;
} Array;
void initArray(Array *a, size_t initialSize) {
a->array = (int *)malloc(initialSize * sizeof(int));
a->used = 0;
a->size = initialSize;
}
void insertArray(Array *a, int element) {
if (a->used == a->size) {
a->size *= 2;
a->array = (int *)realloc(a->array, a->size * sizeof(int));
}
a->array[a->used++] = element;
}
void freeArray(Array *a) {
free(a->array);
a->array = NULL;
a->used = a->size = 0;
}
然后在int main()中:
Array messages;
initArray(&messages, 10);
insertArray(&messages, x); // x is the number we are reading
我可以说密钥是数组中的第一个元素。
但是我不确定如何解析输入并填充messages数组。 (还必须将消息数组保存到另一个数组中)
具有相同键的行也应该保存到同一个数组中(但这是一个细节)。
答案 0 :(得分:1)
你可以试试这个:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define LINELEN 100
#define INITSIZE 10
typedef struct {
int *array;
int key;
size_t used;
size_t currsize;
} line_t;
typedef struct {
line_t *lines;
int numlines;
} array_t;
array_t *initialize_array(void);
void generate_line(array_t *A, int index);
void insert_into_array(array_t *A, int index, char *number);
void printfree_array(array_t *A);
void check_ptr(void *ptr, const char *msg);
int
main(int argc, char *argv[]) {
char line[LINELEN];
char *key;
array_t *A;
size_t arrsize = INITSIZE, count = 0;
A = initialize_array();
A->lines = malloc(arrsize * sizeof(line_t));
check_ptr(A->lines, "Allocation");
printf("Enter data into console:\n");
while (fgets(line, LINELEN, stdin) != NULL && strlen(line) != 1) {
if (arrsize == count) {
arrsize *= 2;
A->lines = realloc(A->lines, arrsize * sizeof(line_t));
check_ptr(A->lines, "Reallocation");
}
generate_line(A, count);
key = strtok(line, " :[],");
A->lines[count].key = atoi(key);
while ((key = strtok(NULL, " :[],\n")) != NULL) {
insert_into_array(A, count, key);
}
count++;
A->numlines++;
}
printfree_array(A);
return 0;
}
void
printfree_array(array_t *A) {
int i, j;
printf("Your array of structures:\n");
for (i = 0; i < A->numlines; i++) {
printf("key = %d, ", A->lines[i].key);
printf("array = [");
for (j = 0; j < A->lines[i].used; j++) {
printf("%d", A->lines[i].array[j]);
if (j != A->lines[i].used-1) {
printf(", ");
}
}
free(A->lines[i].array);
printf("]\n");
}
free(A->lines);
free(A);
}
void
insert_into_array(array_t *A, int index, char *number) {
if (A->lines[index].currsize == A->lines[index].used) {
A->lines[index].currsize *= 2;
A->lines[index].array = realloc(A->lines[index].array,
A->lines[index].currsize * sizeof(int));
check_ptr(A->lines[index].array, "Reallocation");
}
A->lines[index].array[A->lines[index].used++] = atoi(number);
}
void
generate_line(array_t *A, int index) {
A->lines[index].currsize = INITSIZE;
A->lines[index].used = 0;
A->lines[index].key = 0;
A->lines[index].array = malloc(A->lines[index].currsize * sizeof(int));
check_ptr(A->lines[index].array, "Allocation");
}
array_t
*initialize_array(void) {
array_t *A = malloc(sizeof(*A));
check_ptr(A, "Allocation");
A->lines = NULL;
A->numlines = 0;
return A;
}
void
check_ptr(void *ptr, const char *msg) {
if (!ptr) {
printf("Unexpected null pointer: %s\n", msg);
exit(EXIT_FAILURE);
}
}
节目输出here。