设置一个范围在c语言中

Question

要求用户为表格输入一个下限和上限，但要设置限制，使输入保持在0和50之间。使用一个for循环但我不清楚怎么让这个上下限放进for循环

#include<stdio.h>
#include<conio.h>
#include <math.h>
int main(void)
{
// input value
int num, lower, upper;
double squareroot;
int square;
int cube;

printf("enter your number:\n");
scanf_s("%d", &num);

//set the limit for table
    printf("the lower value limit is ");
    scanf_s("%d", &lower);
    printf("the upper value limit is ");
    scanf_s("%d", &upper);

    // the formular to find the squareroot, square, cube
    squareroot = sqrt(num);
    square = num * num;
    cube = num * num * num;

    //a for loop
    for (num = 0; num < 51; num++) {

        printf("*square root*  ||  *square*  ||  *cube*");
        printf("*%f*  ||  *%ld*  ||  *%ld*", squareroot, square, cube);

    }

return 0;

运行结果及不能很整齐而且没能限制一个范围

我的解答思路和尝试过的方法

最后的运行结果想显示一个表格就像这样的

平方根 | 平方 | 立方
4：2 | 16 | 64

Answer 1

根据你的再改一下。

int main()
{ // input value
    int num, lower, upper;
    double squareroot;
    int square;
    int cube;

    printf("enter your number:\n");
    scanf_s("%d", &num);
    for (int n = 0; n < num; n++)
    {

        // set the limit for table
        do
        {
            printf("the lower value limit is ");
            scanf_s("%d", &lower);
        } while (lower < 0 || lower > 50);

        do
        {
            printf("the upper value limit is ");
            scanf_s("%d", &upper);
        } while (upper < 0 || upper > 50);

        // the formular to find the squareroot, square, cube
        printf("┌─────────────────────────────────────────┐\n");
        printf("│ num │  square root  │  square  │  cube  │\n");
        // a for loop
        for (int i = lower; i <= upper; i++)
        {

            printf("├─────────────────────────────────────────┤\n");
            squareroot = sqrt(i);
            square = i * i;
            cube = i * i * i;
            printf("│ %3d │  %11f  │  %6d  │ %6d │\n", i, squareroot, square, cube);
        }
        printf("└─────────────────────────────────────────┘\n");
    }

    return 0;
}