Question

我如何才能打印下列数组中的每种颜色？我想要的输出是这样的红色蓝色白色 ...

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Answer 1

如果你对它们进行排序，那么你可以检查最后一个重复元素是否是前一个元素并打印出来，否则继续这样搜索

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int
compare(const void *const str1, const void *const str2)
{
    return strcmp(str1, str2);
}

int 
main(void)
{
    const char *my_array[20] = {
        "RED", "BLUE", "WHITE", "BLUE", "YELLOW", "BLUE", "RED",
        "YELLOW", "WHITE", "BLUE", "BLACK", "BLACK", "WHITE",
        "RED", "YELLOW", "BLACK", "WHITE", "BLUE", "RED",
        "YELLOW"
    };
    const char *last;
    size_t count;

    count = sizeof(my_array) / sizeof(*my_array);
    if (count == 0) // What?
        return -1;
    qsort(my_array, count, sizeof(*my_array), compare);

    last = my_array[0];
    for (size_t i = 1 ; i < count ; ++i)
    {
        if (strcmp(last, my_array[i]) == 0)
            continue;
        fprintf(stdout, "%s\n", last);
        last = my_array[i];
    }
    // The last one
    fprintf(stdout, "%s\n", last);
    return 0;
}

打印字符串数组的部分

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