Addition of polynomial using array and structure in c

#include <stdio.h>
#include <stdlib.h>
struct poly{
    int exp;
    float coeff;
};
int main()
{
    struct poly a[50],b[50],c[50];
    int i,d1,d2;
    int k=0,l=0,m=0;
    printf("Enter the highest degree of 1st polynomial\n");
    scanf("%d",&d1);
    printf("Enter the highest degree of 2nd polynomial\n");
    scanf("%d",&d2);

    printf("Enter the 1st polynomial \n");

    for(i=0;i<=d1;i++){
            printf("enter the coefficient of x^%d\n",i);
            scanf("%f",&a[i].coeff);
            a[k++].exp = i;
    }

     printf("Enter the 2nd polynomial \n");

    for(i=0;i<=d2;i++){
            printf("enter the coefficient of x^%d\n",i);
            scanf("%f",&b[i].coeff);
            b[l++].exp = i;
    }

    printf("\nExpression of 1st polynomial is %.1f",a[0].coeff);
    for(i=1;i<=d1;i++){

        printf("+%.1fx^%d",a[i].coeff,a[i].exp);

    }

     printf("\nExpression of 2nd polynomial is %.1f",b[0].coeff);
    for(i=1;i<=d2;i++){

        printf("+%.1fx^%d",b[i].coeff,b[i].exp);

    }
    //Addition of polynomials

    if(d1>=d2){

            for(i=0;i<=d2;i++){
                c[m].coeff = a[i].coeff+b[i].coeff;
                c[m].exp = a[i].exp;
                m++;
            }
            for(i=d2+1;i<=d1;i++){
                c[m].coeff = a[i].coeff;
                c[m].exp = a[i].exp;
                m++;

            }
    }
    else{
            for(i=0;i<=d1;i++){
                c[m].coeff = a[i].coeff+b[i].coeff;
                c[m].exp = a[i].exp;
                m++;
            }
            for(i=d1+1;i<=d2;i++){
                c[m].coeff = b[i].coeff;
                c[m].exp = b[i].exp;
                m++;
            }
    }

    //Now print the sum of polynomials
    printf("\nExpression of sum of polynomial is %.1f",c[0].coeff);
    for(i=1;i<m;i++){

        printf("+%.1fx^%d",c[i].coeff,c[i].exp);

    }

    return 0;

}