# Strong password (String problem) in C++

In this tutorial, we will solve the strong password problem in C++ which will have certain mentioned constraints. Let us define our constraints then we will solve the problem.

• Its length should be at least 6.
• Must contain at least one digit.
• There should be at least one lowercase English character.
• It is going to contain at least one uppercase character.
• It should contain at least one special character. The special characters can be: [email protected]#$%^&*()-+ Now we will be given a string of a particular length and we will have to find how many more characters are required to make the password strong. To solve this problem we have to use multiple if-else conditions. In each condition, we have to mention the required condition to get the answer. For example: If the password is Codespeedy. Then it is easy to note that the length of the password is greater than 6 but it doesn’t contain any special character. Neither it contains any digit. So the minimum character required to make it a strong password will be 2. Let move to our coding part in which we will mention different condition to solve this problem. ## Program to Strong password problem CPP source code: // Program to solve strong password problem #include<bits/stdc++.h> using namespace std; int minimumNumber(int n, string password) { // Returning the minimum number of characters // to make the password strong int a=0,b=0,c=0,d=0; for(int i=0;i<n;i++) { if(password[i]=='!' || password[i]=='@' ||password[i]=='#'|| password[i]=='$' || password[i]=='%' || password[i]=='^' ||
{
a=1;
}
{
b=1;
}
{
c=1;
}
{
d=1;
}
}
int sum=a+b+c+d;
if(n<=3)
{
return (6-n);
}
else if((n==4 && sum==1)|| (n==5 and sum ==1))
{
return 3;
}
else if((n==4 && sum==2)|| (n==5 and sum ==2))
{
return 2;
}
else if((n==4 && sum==3)||(n==4 && sum==4))
{
return 2;
}
else if((n==5 && sum==3) || (n==5 && sum==4))
{
return 1;
}
else if(n>=6 && sum==1)
{
return 3;
}
else if(n>=6 && sum==2)
{
return 2;
}
else if(n>=6 && sum==3)
{
return 1;
}
else{
return 0;
}
}
// Driver Code
int main()
{
int n;
cout<<"Enter the length of password: ";
cin>>n;
cout<<"\nMinimum character required to make it a strong password is "
return 0;
}

Input/Output:

Enter the length of password: 10

Minimum character required to make it a strong password is 2