#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
int main() {
    char input[20];
    long n;
    int result;
    char *endptr;
    long sum = 0;
    long count = 0;
    char str[100] = "";
 
    printf("请输入一个正整数: ");
    fgets(input, sizeof(input), stdin);
 
    // 检查输入是否为空
    if (input[0] == '\n') { // 如果输入的第一字符是换行符，说明输入为空
        printf("\nError! No input provided.\n");
        printf("Press any key to continue...\n");
        getchar();
        return 1;
    }
 
    // 使用 sscanf 直接从输入字符串中提取第一个整数
    result = sscanf(input, "%ld%n", &n, &endptr);
 
    if (result == 1 && endptr >= input && *endptr == '\0') {
        // 输入是一个有效的正整数
        if (n > 0) {
            for (long i = 1; i <= n; i++) {
                if (i % 5 == 0 && i % 7 != 0) {
                    sum += i;
                    count++;
                    if (count == 1) {
                        sprintf(str, "%ld", i); // 第一个数
                    } else {
                        strcat(str, " + "); // 添加分隔符
                        sprintf(str + strlen(str), "%ld", i); // 追加下一个数
                    }
                }
            }
 
            printf("\n符合条件的数列和为: %s = %ld\n", str, sum);
            printf("Press any key to continue...\n");
            getchar();
        } else {
            printf("\nError! Input is not a positive integer.\n");
            printf("Press any key to continue...\n");
            getchar();
        }
    } else {
        printf("\nError! Invalid input format.\n");
        printf("Press any key to continue...\n");
        getchar();
    }
 
    return 0;
}

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