大佬们，帮帮忙，2道题

#include <stdio.h>
 
int main(void)
{
    int i;
    for(i=300;i<=400;++i)
    {
        if(i%5==0||i%7==0)
        {
            printf("%d\n",i);
        }
    }
    return 0;
}

#include <stdio.h>
#include <math.h>
 
int main(void)
{ 
        float a, b, c, disc, p, q, h;
 
        printf("please enter a,b ,c:"); 
        scanf("%f %f %f", &a, &b, &c);
 
        printf("%f %f %f\n", a, b, c);
 
        disc = b*b-4*a*c;
 
        if( disc >= 0.0 )
        {
                h = sqrt(disc); 
                p = (-b+h)/(2*a);
                q = (-b-h)/(2*a);
 
                printf("x1=%.4f,x2=%.4f\n h=%.4f\n", p+q, p-q, h);
        }
        else
                printf("No real root\n");
 
        return 0;
}