Question

For an assignment we are supposed to read in a list of dates and associated values (temperatures) from a text document. Values in each line are separated by commas.

Example data:

dd,mm,yyyy,x,y,z,w
01,01,2011,1.1,5.2,6.5,7.5
02,01,2011,2.1,5.2,6.1,1.1
03,01,2011,4.5,2.5,6.1,2.1
...
30,01,2011,4.1,6.1,6.1,2.1
01,02,2011,2.5,6.1,7.1,6.3

So far I have implemented a loop to read each line:

while(scanf("%d,%d,%d,%f,%f,%f,%f", &dd, &mm, &yyyy, &x, &y, &z, &w) == 7)
{
}

We’re given the assumption that there are no errors in the document, and no duplicate dates.

However, there may be missing entries (not each month have complete data; missing days).

I am having trouble detecting if each month’s data (mm) is a complete month or only a partial month.

Eg: 31 days in March 2011. If I have 31 entries from March, I need to print ‘Full month’, otherwise if there are missing days I have to print ‘Partial month’.

So far I have been using if(mm==1){} statements to separate each month inside the while(scanf(...)) loop and then incrementing them in separate variables, then comparing it with the amount of days in a complete month, but I don’t know how to implement it so it detects that mm has changed from the previous line (new month) and perform a certain action (e.g.: calculations)

Sorry if this is confusing!

We have not been taught arrays yet, only operations, loops and functions.

Answer 1

keep prev month value somewhere; finalize monthly related computations and reset the monthly counters when the month you are reading is higher than prev month

int curmonth = 1;
int dd,mm,yyy;
float x,y,z,w;
float xtotal = 0,ytotal = 0,ztotal = 0,wtotal = 0;
while(scanf("%d,%d,%d,%f,%f,%f,%f", &dd, &mm, &yyyy, &x, &y, &z, &w))==7 {
    if (mm == curmonth) {
        //add to current counters
        ztotal+=z;
        ytotal+=y;
        xtotal+=y;
        wtotal+=w;
    } else {
        if (mm < curmonth) 
            //not the expected order as per specs so better die now
            exit(1);
        printf("month=%d,my_calculations=%f,%f,%f,%f\n",xtotal,ytotal,ztotal,wtotal);
        xtotal = ytotal = ztotal = wtotal = 0; curmonth=mm;
    }
}