Question

I am working on some bitmap fonts. The idea here is that I am given two files (input.txt and font.txt). I have to read a string from input.txt and transform it using the contents of font.txt and then print the corresponding output to another file called output.txt. Each character in font.txt is represented by a grid of 16×8.

I just implement a simple [rogram to transform a single Char A using to bitmap as below. Can someone please help me to reduce the code.
Thank You.

int main()
{
    unsigned int arr[]=
                       {
                        0x00,0x00,0x10,0x38,
                        0x6c,0xc6,0xc6,0xfe,
                        0xc6,0xc6,0xc6,0xc6,
                        0x00,0x00,0x00,0x00
                        };

  int i,k,j;
  int bin[8];
  int c=7;
  for(i=0;i<16;++i)
  {

        bin[0]=arr[i]>>7;
        bin[1]=(arr[i]>>6)&1;
        bin[2]=(arr[i]>>5)&1;
        bin[3]=(arr[i]>>4)&1;
        bin[4]=(arr[i]>>3)&1;
        bin[5]=(arr[i]>>2)&1;
        bin[6]=(arr[i]>>1)&1;
        bin[7]=arr[i]&1;
      k=0;  
      for(j=0;j<4;j++){
      if(bin[k]==0 && bin[k+1]==0)
          {
            printf("..");
          }
          else if(bin[k]==0 && bin[k+1]==0)
          {
            printf(".C");
          }
          else if(bin[k]==0 && bin[k+1]==0)
          {
            printf("C.");

          }
          else
          {
            printf("AA");
      }
k=k+2;      
      }
   printf("\n");

  }
}

OUTPUT:

........
........  
..AA....  
..AAAA..  
AAAAAA..  
AA..AAAA  
AA..AAAA  
AAAAAAAA  
AA..AAAA  
AA..AAAA  
AA..AAAA  
AA..AAAA  
........  
........  
........  
........

Answer 1

This produces the same output that you have, but I am ignoring the logic for “.C” and “C.” since your codes does as well. 😉

#include <stdio.h>
int main() {
    unsigned int arr[]=
                       {
                        0x00,0x00,0x10,0x38,
                        0x6c,0xc6,0xc6,0xfe,
                        0xc6,0xc6,0xc6,0xc6,
                        0x00,0x00,0x00,0x00
                        };

  int i,j;
  for(i=0;i<16;++i) {
    unsigned char letter = arr[i];
    for(j =0; j < 7; j++) {
        const char *str = "..";
        if(letter & 0x80) str = "AA";
        fputs(str,stdout);
        letter <<= 1;
    }
    putchar('\n');
  }
}