Some tricks for C/C++

Over the years I've been into coding, I've found many techniques coders use to squeeze out more time out of a program or decrease their coding time. Some of them have been given here, for reference.

Use #define as function:

#define isCaps(i) (i>='A" && i<='Z')
int main()
{
    if (isCaps('S')) printf("S is in Caps\n");
    return 0;
}

Shorten your simple for loops:

#define FOR(i, a, b) for(i=a ; i<b ; i++)
int main()
{
    int i;
    FOR(i, 1, 985)
    {
        printf("%d\n",i);
    }
    return 0;
}

Test whether a number is even or odd:

#define isEven(j) (!(j & 0x01))

Divide a number by 2:

n = n >> 1;

You can find some nice bit tricks in this link. [ Bit twiddling hacks ]
I'll add more when I get these more organized :p.