1、

#include <stdio.h>

int main(void)
{
    int i, num;
    puts("please input an integer.");
    printf("num = "); scanf("%d", &num);
    
    for (i = 1; i <= num; i++)
    {
        if (i< 10)
            printf("%d", i);
        else
            printf("%d", i % 10);
    }
    return 0;
}

 

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