Question

How do i write a program to read muliple files? i can read one but i need to read 10: 0.txt - 9.txt

Here is the code for reading one but i need to read 10 text files and print the frequencies of all the letters a - z, upper and lowercase, in one take.

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <omp.h> int main() { double start_time = omp_get_wtime(); char str[1000); int freq[26]; int ch; int i; FILE* file; printf("The frequencies are:\n"); if((file = fopen("0.txt","r")) == NULL) { printf("error"); exit(1); for(i = 0; i < 26; i++){ freq[i] = 0; while(fgets(str,sizeof(str),file) != NULL) { ch = strlen(str); for(i = 0; i < ch; i++){ if(str[i] >= 'a' && str[i] <= 'z'){ freq[str[i] - 97]++; }else if(str[i] >='A' && str[i] <= 'Z'){ freq[str[i] - 65]++; for(i = 0; i < 26; i++){ if(freq[i] != 0){ printf("%c's: %d\n", (i+65),freq[i]);

here is the output i should get

Answer 1

Points to consider:

1. We need to create an array which will store the name of the file
2. We will keep on changing the file name on every iteration.

Code

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<omp.h>
int main(){
   //double start_time = omp_get_wtime();
   char str[1000];
   int freq[26];
   int ch;
   int i;
   FILE* file;
   printf("The frequencies are: \n");
  
   for(i = 0;i<26;i++){
       freq[i] = 0;
   }
   int file_index = 1;
   char file_name[] = "0.txt";
   if((file = fopen(file_name, "r") == NULL)){
           printf("error");
           exit(1);
   }
   while(file_index<=9){
       file_name[0] = (char)('0' + file_index);
      
       if(file = fopen(file_name, "r") == NULL){
           printf("error");
           exit(1);
       }
       while(fgets(str, sizeof(str), file) != NULL){
           ch = strlen(str);
           for(i = 0;i<ch;i++){
               if(str[i] >= 'a' && str[i] <= 'z'){
                   freq[str[i] - 97]++;
               }else if(str[i] >= 'A' && str[i] <= 'Z'){
                   freq[str[i]-65]++;
               }
           }
       }
       file_index += 1;
   }
   for(i = 0;i<26;i++){
       if(freq[i] != 0){
           printf("%c's: %d\n'", (i+65, freq[i]));
       }
   }
}

That was a nice question to answer
Friend, If you have any doubts in understanding do let me know in the comment section. I will be happy to help you further.
Thanks