我遇到了一个if语句问题，请大佬解惑

这个代码里的if条件满足了以后有时会执行但有时不会，我检查了好几遍感觉没问题啊。。请问哪位能教教我,图在下面
#include<stdio.h>
int main()
{
const float a[6][10]={{2.59,2.40,2.33,2.21,2.09,2.00,1.88,1.80,1.72,1.61},
                {1.88,1.80,1.73,1.68,1.62,1.59,1.53,1.49,1.44,1.36},
                {1.64,1.59,1.55,1.52,1.48,1.46,1.42,1.38,1.34,1.26},
                {1.49,1.46,1.44,1.42,1.39,1.38,1.34,1.31,1.27,1.20},
                {1.39,1.37,1.35,1.34,1.33,1.31,1.29,1.27,1.22,1.17},
                {1.32,1.31,1.30,1.29,1.27,1.26,1.25,1.23,1.20,1.14}
               };
const float dd[10]={6.0,3.0,2.0,1.50,1.20,1.10,1.05,1.03,1.02,1.01};
const float rd[6]={0.04,0.10,0.15,0.20,0.25,0.30};

float d1=0;
float d2=0;
float r=0;

float c,d;
int i,j;
    int p=0;
    int q=0;

printf("enter:D1,D2,r:");
scanf("%f%f%f", &d1,&d2,&r);

c=d1/d2;
d=r/d2;

for(i=0;i<10;i++)
    {
    if(c==dd[i])
        {
            p=i;
            break;
        }
    else if(i>=10)
        {
            break;
        }
    }
for(j=0;j<6;j++)
    {
    if(d==rd[j])
        {
            q=j;
            break;
        }
    else if(j>=6)
        {
            break;
        }
    }
    if(p==i)
    {
        if(q==j)
            printf("a=%.2f\n",a[q][p]);
        else
            printf("There have no a compared\n");
    }
    else
        printf("There have no a compared\n");
    printf("i=%d\nj=%d\np=%d\nq=%d\nc=%.2f\nd=%.2f\n",i,j,p,q,c,d);
    return 0;
}

大概就是这样，这两个算出来的结果是c和d，然后都在上面的矩阵里，所以我就搞不懂到底错在哪。。有大佬可以帮我看看吗..

[此贴子已经被作者于2020-3-23 14:20编辑过]