Print alphabets using patterns in C programming

I have written the following:

char a[7]={0b11111111,
           0b10000001,
           0b10000001,
           0b11111111,
           0b10000001,
           0b10000001,
           0b10000001};

this I have written for all alphabets. I don't know the code to print respective char array when I type a text (for eg. Hello).