fread and fwrite

general
1

I m using code blocks 10.05 and dev c++ but both of them r nt giving any results for fread and fwrite functions… the solutions submitted by others on codechef are also nt giving any results… due to this all i m nt able to try problems which r having large input data or calculation like factorial, and all… plzz tel me wht should i do?? plzz reply…

2

Here is your answer. Simply do not use fread and fwrite, use stdin and stdout…

1 Like
3

u mean use stdin in fread like - fread(buff,1,100000,stdin);
bt dis is also nt working… the below code is the solution submitted by sm1 on codechef of turbo sort problem… i ran it bt the output screen didnt ask any value… nw tel wht i do?? plzz

#include <stdio.h>
 
#define BUFSIZE 32768
 
static char bin[BUFSIZE];
static char bot[BUFSIZE];
static int list[1000001];
 
int main(void)
{
  int i, line;
  int num = 0, lines = 0;
  int r = fread(bin, sizeof(char), BUFSIZE, stdin);
  for(i = 0; i < r && bin[i] >= '0'; i++) {
     lines = (bin[i] - '0') + (10 * lines);
  }
  for(; i < r && bin[i] < '0'; i++);
  for(line = lines; line > 0; i++){
    if(i == BUFSIZE){
      r = fread(bin, sizeof(char), BUFSIZE, stdin);
      i = -1;
    } else if(bin[i] >= '0'){
      num = (bin[i] - '0') + (10 * num);
    } else {
      list[num]++; 
      num = 0;
      line--;
    }
  }
  for(i = line = 0; lines > 0; line++){
    while(list[line]-- > 0){
      if((i + 8) >= BUFSIZE){
        fwrite(bot, sizeof(char), i, stdout);
        i = 0;
      }
      num = line;
      if (num < 100000){
        if (num < 10000){
          if (num < 1000){
            if (num < 100){
              if (num < 10){
                bot[i++] = num + 48;
              } else {
                bot[i+1] = num - num / 10 * 10 + 48;
                bot[i] = num / 10 + 48;
                i += 2;
              }
            } else {
              bot[i+2] = num - num / 10 * 10 + 48;
              num /= 10;
              bot[i+1] = num - num / 10 * 10 + 48;
              bot[i] = num / 10 + 48;
              i += 3;
            }
          } else {
            bot[i+3] = num - num / 10 * 10 + 48;
            num /= 10;
            bot[i+2] = num - num / 10 * 10 + 48;
            num /= 10;
            bot[i+1] = num - num / 10 * 10 + 48;
            bot[i] = num / 10 + 48;
            i += 4;
          }
        } else {
          bot[i+4] = num - num / 10 * 10 + 48;
          num /= 10;
          bot[i+3] = num - num / 10 * 10 + 48;
          num /= 10;
          bot[i+2] = num - num / 10 * 10 + 48;
          num /= 10;
          bot[i+1] = num - num / 10 * 10 + 48;
          bot[i] = num / 10 + 48;
          i += 5;
        }
      } else {
        if (num < 1000000) {
          bot[i+5] = num - num / 10 * 10 + 48;
          num /= 10;
          bot[i+4] = num - num / 10 * 10 + 48;
          num /= 10;
          bot[i+3] = num - num / 10 * 10 + 48;
          num /= 10;
          bot[i+2] = num - num / 10 * 10 + 48;
          num /= 10;
          bot[i+1] = num - num / 10 * 10 + 48;
          bot[i] = num / 10 + 48;
          i += 6;
        } else {
          bot[i+6] = '0';
          bot[i+5] = '0';
          bot[i+4] = '0';
          bot[i+3] = '0';
          bot[i+2] = '0';
          bot[i+1] = '0';
          bot[i] = '1';
          i += 7;
        } 
      }      
      bot[i++] = '\n';
      lines--;
    }
  }
  if(i > 0){
    fwrite(bot, sizeof(char), i-1, stdout);
  }
  return 0;
}
4

No, I was not talking about fread(bin, sizeof(char), BUFSIZE, stdin); construct.

First try your TEST solution. But instead of inserting input from keyboard try the input from file as described in question in the answer above.