View Compilation Error

0_0_20611359_26526.cpp: In function 'int main()':
0_0_20611359_26526.cpp:3:239: error: 'memset' was not declared in this scope
     using namespace std;int const MAX =0x3f3f3f3f; double dp[2][366];double exchange[366];double commissionRate = 0.97;int mask =100;int main(){    int days=0;    while(scanf("%d",&days) && days !=0 )    {        memset(dp,-MAX,sizeof(dp));        dp[0][1]=100000.0;        for(int i=1;i<=days;i++ )            scanf("%lf",&exchange[i]);        dp[1][1] = (dp[0][1]/exchange[1])*commissionRate;        for(int i=2;i<=days;i++)        {            if(dp[0][i-1] > dp[1][i-1]*exchange[i]*commissionRate)                dp[0][i] = (int)dp[0][i-1]+0.0;            else                dp[0][i] =(int)(dp[1][i-1]*exchange[i]*commissionRate)+0.0;             if(dp[1][i-1] > (dp[0][i-1]/exchange[i])*commissionRate)                dp[1][i] = (int)(dp[1][i-1])+0.0;            else                dp[1][i] =(int)((dp[0][i-1]/exchange[i])*commissionRate)+0.0;        }        printf("%.2lf\n",dp[0][days]/100);      }    return 0;}
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