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need help with code that generates random number

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everytime I compile this code it generates the same number

using namespace std;
int main()
   int randnum = rand();
   int num = ((randnum % 50)+1),a;//makes a random number
   cout<<"you got a "<<num;
   return 0;

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Look up the help for srand(). It seeds the pseudo random number generator. Usually you use the time as an argument to it.

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