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#include <stdio.h> | |
#include <string.h> | |
#define MAXIMA_LONGITUD_CADENA 1000 | |
int indiceDeCaracterEnCadena(char *cadena, char caracter) | |
{ | |
int indice = 0; | |
while (cadena[indice] != '\0') | |
{ | |
char actual = cadena[indice]; | |
if (actual == caracter) | |
{ | |
return indice; | |
} | |
indice++; | |
} | |
return -1; | |
} | |
int ultimoIndiceDeCaracterEnCadena(char *cadena, char caracter) | |
{ | |
int indice = strlen(cadena) - 1; | |
while (indice >= 0) | |
{ | |
char actual = cadena[indice]; | |
if (actual == caracter) | |
{ | |
return indice; | |
} | |
indice--; | |
} | |
return -1; | |
} | |
int esCorreoElectronico(char correo[MAXIMA_LONGITUD_CADENA]) | |
{ | |
int indicePunto = indiceDeCaracterEnCadena(correo, '.'); | |
int indiceArroba = indiceDeCaracterEnCadena(correo, '@'); | |
if (indicePunto == -1 || indiceArroba == -1) | |
{ | |
return 0; | |
} | |
if (indicePunto != ultimoIndiceDeCaracterEnCadena(correo, '.')) | |
{ | |
return 0; | |
} | |
if (indiceArroba != ultimoIndiceDeCaracterEnCadena(correo, '@')) | |
{ | |
return 0; | |
} | |
if (indicePunto < indiceArroba) | |
{ | |
return 0; | |
} | |
return 1; | |
} | |
int main() | |
{ | |
printf("%d\n", esCorreoElectronico("parzibyte@ejemplo.com")); // 1 | |
printf("%d\n", esCorreoElectronico("parzibyte.ejemplo@com")); // 0 | |
printf("%d\n", esCorreoElectronico("parzibyte")); // 0 | |
printf("%d\n", esCorreoElectronico("parzibyte@ejemplo")); // 0 | |
printf("%d\n", esCorreoElectronico("parzibyte.ejemplo")); // 0 | |
printf("%d\n", esCorreoElectronico("mi_correo_muy_largo@ejemplo.com")); // 1 | |
} |
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