Problem with pointers while using localtime() and time()

[yop]

See the code below you'll get some usefull indications on what to do:

time_t timval=time(NULL);
    struct tm tims=*(localtime(&timval));
    char temp[100];
    int year;
 
    year=1900+tims.tm_year;
 
    sprintf(temp,"%02d/%02d/%04d - %02d:%02d:%02d",
            tims.tm_mday,tims.tm_mon+1,year,
            tims.tm_hour,tims.tm_min,tims.tm_sec);

time_t timval=time(NULL);
    struct tm tims=*(localtime(&timval));
    char temp[100];
    int year;

    year=1900+tims.tm_year;

    sprintf(temp,"%02d/%02d/%04d - %02d:%02d:%02d",
            tims.tm_mday,tims.tm_mon+1,year,
            tims.tm_hour,tims.tm_min,tims.tm_sec);

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Why don' you use QDateTime insread?

[jamadagni]

struct tm tims=*(localtime(&timval));

This means that localtime returns a pointer, which is dereferenced by the * and the value stored in the variable tm. And &timval corresponds to const time_t *tp.

So this means that whenever I see a * inside the argument part of a function declaration, I must understand that that function must be passed a pointer, and the variables so preceded by stars are handled as pointers within the function.

Similarly whenever I see a * before the function name in the function declaration, that function returns a pointer.

Why don' you use QDateTime insread?

Trying to do some pure ANSI C first before jumping into Qt...

BTW can I know what the meaning of the 1136698157 number is?

[jamadagni]

I tried using

struct tm now = *localtime(&time(NULL));

struct tm now = *localtime(&time(NULL));

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instead of

time_t timval = time(NULL); struct tm now = *localtime(&timval);

time_t timval = time(NULL); struct tm now = *localtime(&timval);

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and got an error:

error: invalid lvalue in unary '&'

Why?

[bood]

I tried using

struct tm now = *localtime(&time(NULL));

struct tm now = *localtime(&time(NULL));

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instead of

time_t timval = time(NULL); struct tm now = *localtime(&timval);

time_t timval = time(NULL); struct tm now = *localtime(&timval);

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and got an error: Why?

What time(NULL) returns is not a left value so cannot be 'get-addressed'
, coz the return value is a temporary value and will be destroyed after the statement.

BTW can I know what the meaning of the 1136698157 number is?

read the manual please