How compare vector size with an integer? [closed]

Answer 1

Use the size_t type to hold collection sizes:

vector vectorX;
size_t intendedSize = 10;
// Some stuff here
if(vectorX.size() != intendedSize) {
     ... 
}

Actually technically you should use vector::size_type but in practice this is always a typedef for size_t

An int is usually a signed 32-bit integer.

size_t is usually an unsigned 64-bit integer (on 64-bit architectures) or an unsigned 32-bit integer (on 32-bit architectures).

(Note that the standard doesn't enforce those constraints. The ABI specifies this, for example the x86 and x86-64 ABI do.)