What is a pragma?

The #pragma preprocessor directive allows each compiler to implement compiler-specific features that can be turned on and off with the #pragma statement. For instance, your compiler might support a feature called loop optimization. This feature can be invoked as a command-line option or as a #pragma directive. To implement this option using the #pragma directive, you would put the following line into your code: #pragma loop_opt(on) Conversely, you can turn off loop optimization by inserting the following line into your code: #pragma loop_opt(off)

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soma praveen kumar

Mar 29th, 2007

consider an example

struct a
{
char a;
int b;
char c;
};

sizeof struct a is 12 instead of 6

if we declare #pragma() Before struct a
Then size will Be 6.