每日一题--20200506--使用到的循环结构

    #include <stdio.h>
    int main()
    {
    printf("Input n:\n");
    int n;
    scanf("%d",&n);
    int i = 1;
    //打印排头
    while (i != n+1) {
        printf("%4d",i);
        if(i == n )
            printf("\n");
        i++;
    }
    //打印分割线
    i = 1;
    while (i != n+1) {
        printf("   -");
        if(i == n )
            printf("\n");
        i++;
    }
    //打印乘法表
    for (i = 1; i < n+1; i++) {
        int j = 0;
        for (; j < i-1; j++) {
            printf("