In c there are many warning messages which can be on or off with help of #pragma warn.
#pragma warn +xxx
#pragma warn –xxx
#pragma warn .xxx
+ means on
- means off
. means on/off (toggle)
xxx is indicate particular warning code in three alphabet. Example: rvl is warning code which means function should return a value.
#pragma warn –rvl
printf("It will not show any warning message");
Output: It will not show any warning message
When you will execute the above program then compiler will not show the warning message function should return a value because rvl warning