Why do we use "==" instead of "=" to show equality in C++ codes????

Question

Coding in C++, equality sign/ symbol

Answer 1

Because = has a different meaning.

int a = 5;

if(a == 7) {
puts("a = 7");
}

This will check if a equals 7 and if it does, it will print "a = 7".

if(a = 7) {
printf("a = %d\n", a);
}

This will set a to 7 and check if 7 evalutes to true. It does, so it'll print "a = 7". In 99% of all cases, you probably don't want to use an if clause to assign a new value to a variable, so a special symbol is needed to separate assignment (=) from equality checking (==).

Answer 2

Because "=" is reserved for different thing.

Answer 3

= is the assignment operator :
int x = 2 ; //variable x is 2
== is the test operator :
2 == 2 //true

That's the same in many langages.