Need to limit the amount of characters read into an array.

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Here is my code. ANY suggestions would be amazing. Basically my question as shown in the subject is that I need some way of taking the data and then stopping after a hundred characters have been read and then go to the next sentence.

#include <stdio.h>
#include <stdlib.h>
int main(void) {
    FILE *f;
    char filename[80];
    char ws;
    int k,r,ls;
    char word[100][100];
    char name[100];
    /*  get a filename from the user  */
    printf(&quot;Enter a filename to read.\n&quot;
    scanf(&quot;%s&quot;, filename);
    /*  open a file for input  */
    if (( f = fopen(filename, &quot;r&quot) == NULL) {
        printf(&quot;Can't open %s.\n&quot;, filename);
        exit(1);
    }
    /*  read one character at a time until end-of-file  */
    for (k=0; k<100;++k){            /*This will fill the array*/
        for (r=0;r<100;++r){        /*This will fill the array*/
            word[k][r]=getc(f);        /*Writes the char into the array*/
            ws=word[k][r];            /*Set so ws will equal the array*/
            ls=ws;                
    
    if (ws=='\n'){                    /*checks for new line*/
        while (r<100){
            word[k][r]=' ';            /*this will fill the array if new line is present*/
            r=r+1;
                     }
            ++k;                    /*this will move the array*/
            r=-1;                    /*corrects the begining number for r*/
                 }
    
    if (ls==13){                    
        word[k][r]=' ';
               }
                
    if (ws=='.'){                    /*checks for end of sentence*/
        r=r+1;
        while (r<100){
            word[k][r]=' ';            /*fills loop*/
            r=r+1;
                      }
        ++k;
        r=-1;
                 }
        
    if (ws=='!'){                    /*same as end of sentence but for !*/
        r=r+1;
        while (r<100){
            word[k][r]=' ';
            r=r+1;
                      }
         ++k;
         r=-1;
                 }
     
     if (ws=='?'){                    /*same as end of sentence but for ?*/
        r=r+1;
        while (r<100){
            word[k][r]=' ';
            r=r+1;
                      }
        ++k;
        r=-1;
                  }
         
          }
      }
     
    for (k=0;k<100;++k){
        for (r=0; r<100;++r){
            printf(&quot;%c&quot;,word[r][k]);    /*THis will print out the columns instead of in rows*/
                                
                            }
        printf(&quot;\n&quot;
                        }
                         
    fclose(f);
    return 0;
}