rand() library name in c++ code example

Example: rand() c++

v1 = rand() % 100;         // v1 in the range 0 to 99  --Credit goes to Clever cowfish
v2 = rand() % 100 + 1;     // v2 in the range 1 to 100
v3 = rand() % 30 + 1985;   // v3 in the range 1985-2014