44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <errno.h>
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void count_letter_frequency_from_file(char * filename) {
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FILE * file;
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file = fopen(filename, "r"); // filename, mode
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// open
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if ( !file ) {
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fprintf(stderr, "Error opening file.\n");
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exit(errno); // exit
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}
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int frequencies[128] = { 0 }; // Contains character frequencies from ascii table, is initialized to 0;
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char * line = malloc( 200 ); // becauase 1 char = 1 byte, 200 chars = 200 bytes
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while ( fgets(line, 200, file) ) { // max 200 chars pe line, gets the line
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for ( int i = 0; line[i]; i++ ) { // process the line char by char
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frequencies[ (int) line[i] ]++; // make the letter and decimal and increments it's possition in the array.
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}
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}
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printf("Characters - Frequencies\n");
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for (int i = 0; i < 128; i++) {
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if ( frequencies[i] && isprint( (char) i ) ) { // different from zero and printable
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printf( "\t %c - %d\n", i, frequencies[i] );
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}
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}
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// close
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if ( fclose(file) ) {
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fprintf(stderr, "Error closing file\n");
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exit(errno);
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}
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free(line);
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}
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int main() {
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count_letter_frequency_from_file("test");
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return 0;
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}
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