C language programming If a heifer gives birth to a cow every year from the fourth year, according to this rule, how many cows will there be in the nth year?

# include & ltiostream & gt

Use namespace std

int main()

{

int I；

int n； //year

Int num// number of cattle

//type[0] represents a newborn cow, type[ 1] represents a cow in the second year after birth, type[2] represents a cow in the third year after birth, and type[3] represents a cow that has started production.

int type[4]={ 1，0，0，0 }；

Cout & lt& lt "Enter number of years:";

CIN & gt； & gtn；

for(I = 1； I & ltn；; i++)

{

Type [3] += Type [2];

type[2]= type[ 1]；

type[ 1]= type[0]；

Type [0] = Type [3];

}

num = type[0]+type[ 1]+type[2]+type[3]；

Cout & lt& lt The total number of cows is: < & ltnum & lt& ltendl.

Returns 0;

}