C和指针之动态内存分配（读取范围在1和标准输入读取的size之前每个数据出现的次数）

1、问题

读取范围在1和标准输入读取的size之前每个数据出现的次数

2、代码实现

#include <stdio.h>#include <stdlib.h>#include <string.h>//读取范围在1和标准输入读取的size之前每个数据出现的次数int *count(int size){if (size <= 0)return NULL;int value, *array = NULL;array = calloc(size, sizeof(int));if (array == NULL)return NULL;printf("请输入1到%d范围的数据\n", size);while (scanf("%d", &value) != EOF){if (value <= 0 && value > size){return NULL;}array[value - 1] += 1;}return array;}int main(){puts("请输入你需要size的大小");int size;scanf("%d", &size);int *array = NULL;array = count(size);if (array != NULL) {for (int i = 0; i < 10; i++){printf("%d has %d count\n", i + 1, array[i]);}free(array);}return 0;}

3、运行结果

请输入你需要size的大小10请输入1到10范围的数据123456789102341 has 1 count2 has 2 count3 has 2 count4 has 2 count5 has 1 count6 has 1 count7 has 1 count8 has 1 count9 has 1 count10 has 1 count