Question

Write a program that validates passwords based on the following requirements:
• must be at least 8 characters in length
• must include at least 1 alphabet character
• must include at least 1 number

The program should implement the password checker using a function name validate_password,
which takes two strings as input and returns one of the following:
• 0 if the passwords match and fulfill all requirements
• 1 if the passwords are not the same length
• 2 if the a number is not found
• 3 if an alphabet character is not found

In main, test your function validate_password by creating 4 sets of passwords and which match one of the conditions listed above and printing the result.

In C program

Answer 1

#include <stdio.h>
#include <string.h>

int validate_password(char *str){
    int letters=0,digits=0;;
     if(strlen(str)<8){
       return 1;
    }
    for(int i=0;i<str[i]!='\0';i++){
        if( (str[i]>='A' && str[i]<='Z') || (str[i]>='a' && str[i]<='z') )
            letters=1;
        if(str[i]>='0' && str[i]<='9')
            digits=1;
    }
   if(!digits)
    return 2;
   if(!letters)
   return 3;
   
   return 0;
   
}
void printRes(int n){
    switch(n){
        case 0:printf("Valid Password\n");break;
        case 1:printf("Password length is less than 8 chars\n");break;
        case 2:printf("Password does not contain digits\n");break;
        case 3:printf("Password does not contain characters\n");break;
    }
}
int main()
{
  char str[20];
  printf("Enter Password : ");
  scanf("%s",str);
  printRes(validate_password(str));
  printf("Enter Password : ");
  scanf("%s",str);
  printRes(validate_password(str));
  printf("Enter Password : ");
  scanf("%s",str);
  printRes(validate_password(str));
  printf("Enter Password : ");
  scanf("%s",str);
  printRes(validate_password(str));
    
   

}

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