normal C: the programmer will write what type they want, easy
C++: we're fancy, the compiler can, like, infer type stuff on the left side of an assignment based on the type on the right side! it might make it a little harder to figure out stuff like iterator types without a fancy IDE but it will be worth the convenience if the feature isn't overused
Rust: you're like a baby, hold my beer, we will infer part of the type of a variable based on WHAT HAPPENS DOZENS OF STATEMENTS FURTHER DOWN mwahaHAHAHAHAHA good luck trying to read this code in one pass suckers