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BubbleSort reading the data with fread() function from inFILE
/**
Author: Adrian Statescu <http://adrianstatescu.com>
How does fread really work?!
The declaration of FREAD is as following:
size_t fread(void *ptr, size_t size, size_t nmem, FILE *stream)
There may or may not be any difference in performance. There is a difference in semantics.
fread(a, 1, 1000, stdin); -> attempts to read 1000 data elements each of which is 1 byte long
fread(a, 1000, 1, stdin); -> attempts to read 1 data element which is 1000 bytes long
*/
#include <stdio.h>
#include <malloc.h>
#define FIN "algsort.in"
#define FOUT "algsort.out"
int p = 31999;
char buff[ 32010 ];
void __b__s(int *p, int n) {
int finished = 0, swapped, size = n, i;
while(!finished) {
swapped = 0;
for(i = 0; i < size - 1; ++i) {
if(p[i] > p[i+1]) {
int tmp = p[i]; p[i] = p[i+1]; p[i+1] = tmp; swapped = 1;
}
}
if(swapped) size--;else finished = 1;
}
}
void inc() {
p++;
if(p == 32000) {
p = 0; fread(buff, 1, 32000, stdin);
}
}
void read(int *x) {
while(buff[p] < '0' || buff[p] > '9') inc();
*x = 0;
while(buff[p] >= '0' && buff[p]<= '9') {
*x = 10*(*x) + buff[p] - '0';
inc();
}
}
int main() {
int *x, *n, i, k = 0 , vec[32000];
freopen(FIN, "r", stdin);
freopen(FOUT, "w", stdout);
n = (int*)malloc(sizeof(int));
read(n);
x = (int*)malloc(sizeof(int));
for(i = 0; i < *n; i++) {
read(x);
vec[k++] = *x;
}
__b__s(vec, *n);
for(i = 0; i < *n; ++i) printf("%d ", vec[i]);
free(n);
free(x);
return(0);
};
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