what's wrong in this program

#include<stdio.h>

int main()
{
    int x[5][5],y[5][5],z[5][5],r1,c1,r2,c2,i,j;
    printf("\nenter the size of matrix");
    scanf("%d%d",&r1,&c1);
      printf("\nenter the size of 2nd matrix");
    scanf("%d%d",&r2,&c2);
    if(r1!=r2||c1!=c2)
    {
        printf("\nmatrix addition is not possible");

    }
    else
    {
        printf("\nenter%d*%dmatrix",r1,c1);

    }
    for(i=0;i<r1;i++)
    {
        for(j=0;i<c1;j++)
        {
            scanf("%d",&x[i][j]);
        }
    }
    printf("\nenter%d*%dmatrix",r2,c2);
    for(i=0;i<r2;i++)
    {
     for(j=0;j<c2;j++)
        {
            scanf("%d",&y[i][j]);
        }
    }
    for(i=0;i<r1;i++)
    {
        for(j=0;j<c2;j++)
        {
            z[i][j]=x[i][j]+y[i][j];
        }
    }
    printf("\naddition of two matrices is ");
    for(i=0;i<r1;i++)
    {
        for(j=0;j<c1;j++)
        {
            printf("%d\t",z[i][j]);
        }
        printf("\n");
    }
}