Increment function call by reference

#include <stdio.h> void increment(int *var) { /* Although we are performing the increment on variable * var, however the var is a pointer that holds the address * of variable num, which means the increment is actually done * on the address where value of num is stored. */ *var = *var+1; } int main() { int num=20; /* This way of calling the function is known as call by * reference. Instead of passing the variable num, we are * passing the address of variable num */ increment(&num); printf("Value of num is: %d", num); return 0; }