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Source Code
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#include <cstring>
using namespace std;
bool compa(char* p){
int L;
L = strlen(p);
if(*p == '4' && L == 16)
cout<<"La tarjeta es Visa\n";
else if(*p == '5' && L == 16)
cout<<"La tarjeta es MasterCard\n";
else if(*p == '3' && L == 15)
cout<<"La tarjeta es American Express\n";
else{
cout<<"La tarjeta NO es valida\n";
return false;
}
return true;
}
void verificar(char* p){
int i, n=strlen(p), dp, s=0;
for(i=n-2; i>=0; i=i-2){
dp = (*(p+i)-48)*2;
if (dp >= 10)
dp = dp%10+dp/10;
*(p+i) = dp+48;
}
for(i=0; i<n; i++){
s = s+*(p+i)-48;
}
if (s%10 == 0)
cout<<"La tarjeta SI es valida\n";
else
cout<<"La tarjeta NO es valida\n";
}
int main(){
char* p;
p = new char[17];
cout<<"Escriba un numero: ";
cin.getline(p, 17);
if (compa(p))
verificar(p);
return 0;
}
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