Password Strength Checker
C
Hard
4 views
Problem Description
Have the user input a password (it should not be visible on the screen). Then check: minimum 8 characters, at least 1 digit, and 1 uppercase letter. Report the result and provide suggestions if applicable.
Official Solution
#include <stdio.h>
#include <conio.h>
#include <ctype.h>
#include <string.h>
int main() {
char password[50];
int i = 0;
int hasUpper = 0, hasDigit = 0;
printf("Enter password: ");
// Read password without echo
while (1) {
char ch = getch();
if (ch == 'r') { // Enter key
password[i] = ' ';
break;
}
else if (ch == 'b' && i > 0) { // Backspace
i--;
}
else if (i < 49) {
password[i++] = ch;
}
}
printf("n");
// Check conditions
for (i = 0; password[i] != ' '; i++) {
if (isupper(password[i]))
hasUpper = 1;
if (isdigit(password[i]))
hasDigit = 1;
}
// Report results
if (strlen(password) >= 8 && hasUpper && hasDigit) {
printf("Password is VALID.n");
} else {
printf("Password is INVALID.n");
printf("Suggestions:n");
if (strlen(password) < 8)
printf("- Use at least 8 charactersn");
if (!hasUpper)
printf("- Add at least one uppercase lettern");
if (!hasDigit)
printf("- Add at least one digitn");
}
return 0;
}
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