CODEWITHSUNDEEP
c
Kat
Kat

Reputation: 9

warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int'

This is for my into to C class, and I can't figure out why I'm getting this error:

while (scanf ("%d", (int)ph[i].vi.temperature) < 0) { 
warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int'

Code:

struct vitalInformation {
    float temperature;
    unsigned int systolicPressure;
    unsigned int diastolicPressure;
};

struct activityInformation {
    unsigned int stepCount;
    unsigned int sleepHours;
};

union patientHealth{
    struct vitalInformation vi;
    struct activityInformation ai;
} ph[100]; 

int i = 0;

int menu(){
    int option;

    printf ("Please enter the number for the desired action (1, 2, 3):\n");
    printf ("1 - Enter some patient vital information\n");
    printf ("2 - Enter some patient activity information\n");
    printf ("3 - Print summary information on the patient information and exit the program\n");

    scanf ("%d", &option);

    while (scanf("%d", &option) || option<1 || option>3) {
        printf ("Please enter 1, 2, or 3\n\n");
        printf ("Please enter the number for the desired action (1, 2, 3):\n");
        printf ("1 - Enter some patient vital information\n");
        printf ("2 - Enter some patient activity information\n)");
        printf ("3 - Print summary information on the patient information and exit the program\n");

        fflush (stdin);
        scanf ("%d", &option);

    }

    return option;
}

void patientVitalInfo(int *countP, float *minT, float *maxT, int *minS, int *maxS, int *minD, int *maxD) {
    printf ("Enter the temperature: ");
    scanf ("%f", &ph[i].vi.temperature);

    while (scanf ("%d", (int)ph[i].vi.temperature) < 0) {
        printf ("Please enter an integral unsigned number\n");
        printf ("Enter the temperature: ");

        fflush (stdin);
        scanf ("%f", &ph[i].vi.temperature);
    }
}

Upvotes: 0

Views: 6527

Answers (1)

sancho.s ReinstateMonicaCellio
sancho.s ReinstateMonicaCellio

Reputation: 15641

The error reported comes from your line 

while (scanf ("%d", (int)ph[i].vi.temperature) < 0) {

which is casting whatever you get form ph[i].vi.temperature (in this case, a float) into an int, while scanf requires a pointer to an int.

Now, in your case, you seem to need the temperature as an int, while ph[i].vi.temperature holds a float, so you would rather use another int variable, say

int itemp;
scanf ("%d", &itemp);

for the input and then 

ph[i].vi.temperature = (float) itemp;

for the casting. Or, you could simply scanf ("%f", &ph[i].vi.temperature); and then keep the integral part. I wouldn't know your needs nor the logic behind your code.

Note: I am not sure you are using the return value of scanf in a way matching your needs either. In your case, scanf can return 0, 1 or EOF.

Upvotes: 2

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