I am wondering if its possible to execute a part of code in main() that will not affect the rest of the execution. For example assign different values to variables that will be only valid inside a particular part of the main() and after exiting this part the old values will exist. Is there anything that I could look at?
Many thanks
Chris
sorry i am little confused with the question the old values should exist or should not exist. i think it is not exist, then you can very well use blocks. i have just attached a sample code where the variable "i" has different values.Originally Posted by Chris_1980
thanks and regards,Code:#include <stdio.h> int main(int argc, char *argv[]) { { int i; i=12; printf("%d",i); } { int i; i = 13; printf("%d",i); } return 0; }
satya
A function with pass by value parameters? You should explain better what exactly you're trying to do.
Lets say I have a structure:And in a while loop the values of array are changed. In the loop in every iteration I have a report function where I sort the old_chrome[100] form 0 to 99 concerning the value fitness. Now, when I exit the report function I want the members of the structure to be like before and not sorted old_chrome[0] to 99.Code:struct chromosome { array[100]; fitness;}; struct chromosome old_chrome[100];
Like the report function never existed.
Well as long as you aren't changing them inside the function, you have nothing to worry about. Otherwise you can make a copy of them inside the function, and then use that:The reason you actually have to make a copy here is because arrays are passed as a pointer to the first element. Whereas if you were passing a single integer around, that integer would actually be passed as a copy.Code:void foo( type array[], int size ) { type copy[ size ]; int x; for( x = 0; x < size; x++ ) copy[ x ] = array[ x ]; ... do stuff to copy }Code:void foo( int x ) { x++; printf( "x is %d\n", x ); } ... int x = 3; printf( "x outside of foo is %d\n", x ); foo( x ); printf( "x outside of foo is %d\n", x );
Quzah.
Hope is the first step on the road to disappointment.
Thanks for the reply.
Chris
