c point study -- (exchange two variable value)

c point study

/**
*  The c point study notes
*  below is a exchange two specified variable value case
*/

//this function is do not return any value
//the two parameter is a pointer variable of type int
void exchangeNum(int *num1, int *num2){
   int t = *num1;
   *num1 = *num2;
   *num2 = t;
}

int a = 2; //define a 32-bit int variable
int b = 3; //define a 32-bit int variable

exchangeNum(&a, &b); //the symbol "&" is mean get that int variable's memory location

printf("%i %i", a, b); //we found a, b value is change

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