A constructor that takes a single argument is, by default, an implicit conversion operator, which converts its argument to an object of its class, the keyword “explicit” can be placed before the constructor with one parameter to avoid such implicit conversions.
Sample Code:
#include class test{ int i; int j;public: test() { i=100; j=200; } explicit test(int x) { i=x; j=x+10; } void disp() { cout<<"I="<