50179. Split a file into many files
難度：4.4/5
有幾個小問題： 1. \(N \leq 10\)，所以output file的名字在第十個的時候要特別處理。 2. c = fgetc(f_in)的return value就是c。所以while(c = fgetc(f_in))會在讀到0的時候出問題。 3. 要用unsigned char讀而不是char讀。1
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58#include <stdio.h>
#include <string.h>
char ip_file_name[1000];
char op_file_prefix[1000];
int n;
FILE* f_in;
FILE* f_out[100];
int p = 0;
char buffer[3000000];
int get_min_idx(int arr[]){
int min_idx = 0;
for(int i = 1; i < n; i++){
if(arr[i] < arr[min_idx]) min_idx = i;
}
return min_idx;
}
int main(){
scanf("%s", ip_file_name);
scanf("%d", &n);
scanf("%s", op_file_prefix);
f_in = fopen(ip_file_name, "rb");
int op_len = strlen(op_file_prefix);
for(int i = 0; i < n; i++){
if(i < 9){
op_file_prefix[op_len] = '0' + i + 1;
op_file_prefix[op_len + 1] = '\0';
}
else{
op_file_prefix[op_len] = '1';
op_file_prefix[op_len + 1] = '0';
op_file_prefix[op_len + 2] = '\0';
}
f_out[i] = fopen(op_file_prefix, "wb");
}
int file_size[100] = {0};
while(!feof(f_in)){
int min_idx = get_min_idx(file_size);
unsigned char c;
printf("%d started\n", min_idx);
while((!feof(f_in)) && (c = fgetc(f_in)) != EOF && (c != 255)){
printf("putting %d to %d\n", c, min_idx);
fputc(c, f_out[min_idx]);
file_size[min_idx]++;
}
printf("%d endded\n", min_idx);
}
fclose(f_in);
for(int i = 0; i < n; i++) fclose(f_out[i]);
}