Validate a password (1234 as correct)

Last update on March 18 2025 13:30:32 (UTC/GMT +8 hours)

C Practice Exercise

Write a C program to read a password until it is valid. For wrong password print "Incorrect password" and for correct password print, "Correct password" and quit the program. The correct password is 1234.

C Code:

#include <stdio.h>
int main() {
    int pass, x = 10; // Initialize variables for password and loop control

    while (x != 0) {
        printf("\nInput the password (numeric characters only): ");
        scanf("%d", &pass); // Read the password input

        if (pass == 1234) {
            printf("Correct password"); // If the password is correct, print a success message
            x = 0; // Set x to 0 to exit the loop
        } else {
            printf("Wrong password, try another"); // If the password is incorrect, prompt for another attempt
        }

        printf("\n");
    }

    return 0;
}

Sample Output:

Input the password: 1234                                                                             
Correct password

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to validate a password with a maximum of three attempts before locking the user out.
• Write a C program to check a password ensuring it contains at least one uppercase letter, one lowercase letter, and one digit.
• Write a C program to validate a password and lock the system after a specified number of incorrect attempts.
• Write a C program to validate a password based on case sensitivity and a minimum length requirement.

C Programming Code Editor:

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