Semana 9¶
Esta semana vamos a realizar los ejercicios propuestos en la guía de hilos.
Material¶
La guía de trabajo para el tema de hilos está aquí. Al final de la guía hay ejercicios tipos examen llamados alimento para el pensamiento.
Dejo como referencia una posible solución a la evaluación sumativa 1:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 | #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define COMMANDMAXSIZE 50
#define NAMEMAXSIZE 30
char commandBuffer[COMMANDMAXSIZE + 1];
const char makeDatabase[] = "mkdb";
const char loadDatabase[] = "loaddb";
const char saveDatabase[] = "savedb";
const char readAllRegisters[] = "readall";
const char readDbSize[] = "readsize";
const char readDbCapacity[] = "readcapacity";
const char makeRegister[] = "mkreg";
const char readRegister[] = "readreg";
const char quit[] = "exit";
int makeDatabasefn(int);
int loadDatabasefn(char *);
void saveDatabasefn(char *);
void readAllRegistersfn(void);
int readsizefn(void);
int makeRegisterfn(int, char *, int );
int readRegisterfn(int);
void quitfn(void);
struct estudiante
{
int cedula;
char nombre[30];
int semestre;
};
char currentDataBaseName[50];
int currentDataBaseSize = 0;
struct estudiante *pcurrentDataBase;
int currentDataBaseRegister = 0;
int main()
{
while(1){
printf(">");
if ( fgets(commandBuffer, COMMANDMAXSIZE + 1,stdin) != NULL){
int commandSize = strlen(commandBuffer);
if(commandBuffer[commandSize - 1] != '\n'){
printf("Error: command too long \n");
return EXIT_FAILURE;
}
else{
commandBuffer[commandSize - 1] = 0;
}
if( 0 == strncmp(makeDatabase, commandBuffer, strlen(makeDatabase) ) ){
char* token = strchr(commandBuffer, ' ');
if(token != NULL){
int result = sscanf(token + 1, "%s %d", currentDataBaseName, ¤tDataBaseSize);
if(result != 2){
currentDataBaseName[0] = 0;
currentDataBaseSize = 0;
printf("Enter a valid arguments\n");
}
else{
if ( makeDatabasefn(currentDataBaseSize) != 1){
printf("Database can't be created\n");
}
}
}
else{
printf("Enter a valid arguments\n");
}
}
else if ( 0 == strncmp(readAllRegisters, commandBuffer, strlen(readAllRegisters) ) ){
readAllRegistersfn();
}
else if ( 0 == strncmp(makeRegister, commandBuffer, strlen(makeRegister) ) ){
char* token = strchr(commandBuffer, ' ');
char name[50];
int cedula;
int semestre;
if(token != NULL){
int result = sscanf(token + 1, "%d %s %d", &cedula, name,&semestre);
if(result != 3){
printf("Enter a valid register arguments\n");
}
else{
if( makeRegisterfn(cedula, name, semestre) != 1){
printf("Data base is full, register was not created\n");
}
}
}
}
else if( 0 == strncmp(saveDatabase, commandBuffer, strlen(saveDatabase) ) ){
if(currentDataBaseName[0] == 0){
printf("Load a data base first\n");
continue;
}
char* token = strchr(commandBuffer, ' ');
if(token != NULL){
int result = sscanf(token + 1, "%s", currentDataBaseName);
if(result != 1){
printf("Enter a name\n");
}
else{
saveDatabasefn(currentDataBaseName);
}
}
else{
printf("Enter a name\n");
}
}
else if( 0 == strncmp(quit, commandBuffer, strlen(quit) ) ){
if(currentDataBaseName[0] == 0){
printf("No active db\n");
continue;
}
printf("save data base with name %s? y/n: ",currentDataBaseName);
if (fgets(commandBuffer, COMMANDMAXSIZE + 1,stdin) != NULL){
int commandSize = strlen(commandBuffer);
commandBuffer[commandSize - 1] = 0;
if( 0 == strncmp("y", commandBuffer, 1) ){
saveDatabasefn(currentDataBaseName);
}
}
return EXIT_SUCCESS;
}
else if( 0 == strncmp(loadDatabase, commandBuffer, strlen(loadDatabase) ) ){
char* token = strchr(commandBuffer, ' ');
char name[50];
if(token != NULL){
int result = sscanf(token + 1, "%s",name);
if(result != 1){
printf("Enter a data base name\n");
}
else{
if( loadDatabasefn(name) == 0){
printf("Can't load de database\n");
}
else{
strncpy(currentDataBaseName, name, 50);
}
}
}
else{
printf("Enter a database name\n");
}
}
else if( 0 == strncmp(readDbSize, commandBuffer, strlen(readDbSize) ) ){
printf("%d\n",currentDataBaseRegister);
}
else if( 0 == strncmp(readDbCapacity, commandBuffer, strlen(readDbCapacity) ) ){
printf("%d\n",currentDataBaseSize);
}
else if( 0 == strncmp(readRegister, commandBuffer, strlen(readRegister) ) ){
char* token = strchr(commandBuffer, ' ');
int cedula;
if(token != NULL){
int result = sscanf(token + 1, "%d",&cedula);
if(result != 1){
printf("Enter a numeric id number\n");
}
else{
if( readRegisterfn(cedula) == 0){
printf("Can't find the id number in the database\n");
}
}
}
else{
printf("Enter a id number\n");
}
}
else{
printf("Not valid command\n");
}
}
else{
perror("Error: ");
return EXIT_FAILURE;
}
}
return EXIT_SUCCESS;
}
int makeDatabasefn(int size){
int success = 0;
pcurrentDataBase = (struct estudiante *) malloc( sizeof(struct estudiante)*size );
if(pcurrentDataBase != NULL) success = 1;
return success;
}
void readAllRegistersfn(void){
for(int i = 0; i < currentDataBaseRegister; i++){
printf("registro %d cedula: %d, nombre: %s, semestre: %d\n", i+1, (pcurrentDataBase + i)->cedula,(pcurrentDataBase + i)->nombre, (pcurrentDataBase + i)->semestre);
}
}
int makeRegisterfn(int cedula, char * nombre, int semestre){
int result = 0;
if(currentDataBaseRegister < currentDataBaseSize){
(pcurrentDataBase+ currentDataBaseRegister)->cedula = cedula;
strncpy( (pcurrentDataBase+ currentDataBaseRegister) ->nombre, nombre, NAMEMAXSIZE);
(pcurrentDataBase+ currentDataBaseRegister)->semestre = semestre;
currentDataBaseRegister++;
result = 1;
}
return result;
}
void saveDatabasefn(char * name){
FILE *fp = fopen(name, "w+");
fprintf(fp,"%d\n",currentDataBaseSize);
for(int i = 0; i < currentDataBaseRegister; i++){
fprintf(fp, "%d %s %d\n", (pcurrentDataBase + i)->cedula,(pcurrentDataBase + i)->nombre, (pcurrentDataBase + i)->semestre);
}
fclose(fp);
}
int loadDatabasefn(char * dataBaseFileName){
int currentDataBaseSizeTmp = 0;
struct estudiante *pcurrentDataBaseTmp;
int currentDataBaseRegisterTmp = 0;
int result = 0;
FILE *fp = fopen(dataBaseFileName, "r");
if(fp == NULL){
perror("Error: ");
}
else{
int scanfStatus = fscanf(fp,"%d", ¤tDataBaseSizeTmp);
if(feof(fp) == 0){
if(scanfStatus == 1){
pcurrentDataBaseTmp = (struct estudiante *) malloc( sizeof(struct estudiante)*currentDataBaseSizeTmp );
if(pcurrentDataBaseTmp != NULL){
while(1){
int scanfStatus = fscanf(fp,"%d %s %d", &((pcurrentDataBaseTmp + currentDataBaseRegisterTmp)->cedula), (pcurrentDataBaseTmp + currentDataBaseRegisterTmp)->nombre, &((pcurrentDataBaseTmp + currentDataBaseRegisterTmp)->semestre) );
if(feof(fp) == 0){
if(scanfStatus != 3){
free(pcurrentDataBaseTmp);
break;
}
else{
currentDataBaseRegisterTmp++;
}
}
else{
result = 1;
pcurrentDataBase = pcurrentDataBaseTmp;
currentDataBaseSize = currentDataBaseSizeTmp;
currentDataBaseRegister = currentDataBaseRegisterTmp;
break;
}
}
}
}
else{
printf("Can't read database size\n");
}
}
else{
printf("Can't read database\n");
}
fclose(fp);
}
return result;
}
int readRegisterfn(int id){
int result = 0;
for(int i = 0; i < currentDataBaseRegister;i++){
if( (pcurrentDataBase + i)->cedula == id ){
result = 1;
printf("registro %d cedula: %d, nombre: %s, semestre: %d\n", i+1, (pcurrentDataBase + i)->cedula,(pcurrentDataBase + i)->nombre, (pcurrentDataBase + i)->semestre);
break;
}
}
return result;
}
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