#include <stdio.h>

int main()
{
    float x, y=0;
   
    printf("Enter a number: ");
    scanf("%f", &x);
   
    do
    {
        if (x > y)
            x = x;
        else
            x = y;
        
        printf("Enter a number: ");
         scanf("%f", &y);
         
    }while (y > 0);
   
    printf("The largest number entered was %f\n", x);
   
    return 0;
}

原程序~~~求解

题目是要求：用户一个一个输入大于0的数，然后输出最大的那个数~要用while或者do while~作业题目~~

对了~要求当输入0或负数时结束程序~