Created
October 15, 2019 10:50
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bubblesort em disco
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void bubblesort(FILE *F) | |
{ | |
int i, j, n; | |
registro aux1, aux2; | |
int sizer = sizeof(registro); | |
//calcula o numero de registros | |
fseek(F, 0, SEEK_END); | |
n = ftell(F) / sizer; //ftell retorna numero de bytes tem arquvio (F); fteel/sizer retorna numero de registros armazenados | |
for(i = 1; i < n; i++) | |
{ | |
for(j = n - 1;j >= i; j--) | |
{ | |
//posiciona para fazer a leitura | |
fseek(F, (j - 1)*sizer, SEEK_SET); | |
//le os dados dos registros adjacentes para a memoria | |
fread(&aux1, sizer, 1, F); | |
fread(&aux2, sizer, 1, F); | |
//compara os registros por nome | |
if (strcmp(aux1.nome, aux2.nome)>0) //aux1>aux2 | |
{ | |
//posiciona para trocar | |
fseek(F, (j -1)*sizer, SEEK_SET); | |
//troca aux1 e aux2 | |
fwrite(&aux2, sizeof(registro), 1, F); | |
fwrite(&aux1, sizeof(registro), 1, F); | |
} | |
} | |
} | |
} |
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