Thread: how to read characters from file

Hi,

i'm new with C language. I got task to do . Actually there are 2 points. Both should be done with reading text from file.

1. write down all letters from text in reverse alphabetic order (each letter 1 time).
2. write down all words in random order.

I'm stuck with first point. Below code gives me entire text, but i need unique characters only. Text file contains few sentences.

Code:

#include<stdio.h>
void main( )
{
FILE *in;
int ch;
if ( (in = fopen("test.txt", "r") ) != NULL )

{
while( (ch= fgetc(in) ) != EOF )
fputc(ch, stdout);
fclose(in);
}
else
printf("File test.txt not open... \n");
}

Hi,

thank you for tips. I was trying to find how to put text (letters) into array, but i found only about numbers. Maybe someone could show me how this code should look? Should it be putted into 1D or 2D array?

Thanks

I tried this code, but it gives me nothing.

Code:

#include <stdio.h>


int main(void)
{
    int i;
    FILE *in = fopen("test.txt", "r");
    if (in) {
        char mas[50];
        size_t n = 0;
        int ch;
        while ((ch = getc(in)) != EOF) {
            mas[n++] = (char)ch;
        }
        fclose(in);


        }
    for(i=0;i<50;i++)
    {printf("%c",mas[i]);
    printf("\n");}
    return 0;
}

Hi,

i manage to write codes for both tasks. I'm just stuck with one thing - i have string array with words from text. How can i sort them in random way? This is my code to get string array.

Code:

#include<stdio.h>
#include<string.h>
#include <stdlib.h>
#include <time.h>
int main()
{
    /*declare and initialise variable*/
    char message[10][150],buffer[150];
    int i=0;
    FILE *file_in;
    file_in=fopen("test.txt", "r");
    /*stores and prints the data from the string*/
    while(fgets(buffer,150,file_in)){
        strcpy(message[i],buffer);
        printf("%s",message[i]);
        i++;
    }


    getchar();
    return 0;
}

Hi, i have this code, but it gives me blank screen when i run it.

Code:

#include<stdio.h>
#include<string.h>
#include <stdlib.h>
#include <time.h>
int main()
{


    char message[10][150],buffer[150];
    int i=0;
    int cntr=9;
    int freeArray[9];
    srand(time(NULL));
    for (i=0;i<cntr;i++)
    freeArray[i]=rand()%cntr;
    FILE *file_in;
    file_in=fopen("test.txt", "r");


    while(fgets(buffer,150,file_in)){
    strcpy(message[freeArray[i]], buffer);
    }
while(cntr>=0)
 {
i=rand() % cntr;
strcpy(message[freeArray[i]], buffer);
  freeArray[i] = freeArray[cntr--];
  printf("%s", message[freeArray[i]]);
 }


    return 0;
}