Odd data entry error, reading an unsigned integer with scanf

Hi all, this is probably the first time I have ever actually asked a question on the board, so Ill give it my best.

This is a simple homework assignment, and I have pretty much finished except for a weird bug that won't go away. The point of the assignment is dealing with how to store data in a much smaller fashion, what I am doing is taking input from the user, dealing with a students record of some sort. It stores the persons current age, grade, gender, and current gpa al in a 16bit integer (short on my system thats why I used it). Well every thing is fine except that the first value I read in (Age) is always a 0, no matter what I enter. The code and a sample run below

Code:

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

#define AGE_MASK 0xF000;
#define GRADE_MASK 0x0F00;
#define SEX_MASK 0x0080;
#define GPA_MASK 0x007E;

int main()
{
    unsigned short studentinfo, age, grade, sex, gpa;
    unsigned char gender;
    printf("Please enter the students Age, Grade, Sex as 'M' or 'F',\n");
    printf("and GPA without the decimal point.\n");
    /*
    scanf(" %u %u %c %u", &age, &grade, &gender, &gpa);
    printf("%u %u %c %u\n", age, grade, gender, gpa);*/

    printf("AGE: ");
    scanf(" %u",&age);
    printf("Grade: ");
    scanf(" %u",&grade);
    printf("Sex: ");
    scanf(" %c",&gender);
    printf("GPA: ");
    scanf(" %u",&gpa);
    printf("%u %u %c %u\n", age, grade, gender, gpa);
    if( isalpha(gender) != 0)
    {
        gender = toupper(gender);
    }
    else
    {
        printf("Error: You need to enter a character for sex\n");
        exit(EXIT_FAILURE);
    }

    if( gender == 'M')
    {
        sex = 1;
    }
    else if( gender == 'F' )
    {
          sex = 0;
    }
    else
    {
            printf("Error: You need to enter M or F for the students sex\n");
            exit(EXIT_FAILURE);
    }

    age = age - 3;

    studentinfo = 0;
    studentinfo |= (age << 12) & AGE_MASK;
    studentinfo |= grade << 8 & GRADE_MASK;
    studentinfo |= (sex << 7) & SEX_MASK;
    studentinfo |= (gpa << 1)& GPA_MASK;
    printf("%u\n",studentinfo);
    printf("%u\n",age);
    exit(EXIT_SUCCESS);
}

Code:

Please enter the students Age, Grade, Sex as 'M' or 'F',
and GPA without the decimal point.
AGE:     14
Grade:  10
Sex: F
GPA: 35
0 10 F 35
55878
65533

If you have any ideas let me know, I just don't understand why its getting 0 every time it reads the first value.

hello.c:21: warning: unsigned int format, different type arg (arg 2)
hello.c:23: warning: unsigned int format, different type arg (arg 2)
hello.c:27: warning: unsigned int format, different type arg (arg 2)

My guess is you should use %hu for reading in unsigned shorts

gcc -Wall prog.c
saves the day yet again.

Originally Posted by Salem

hello.c:21: warning: unsigned int format, different type arg (arg 2)
hello.c:23: warning: unsigned int format, different type arg (arg 2)
hello.c:27: warning: unsigned int format, different type arg (arg 2)

My guess is you should use %hu for reading in unsigned shorts

gcc -Wall prog.c
saves the day yet again.

LOL, I should have thought of using -Wall, doh. need to read the gcc manual again.

And thank you, that did fix the problem, I feel so stupid for the moment.