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functionssrand<cstdlib>voidsrand(unsignedintseed);InitializerandomnumbergeneratorThepseudo-randomnumbergeneratorisinitializedusingtheargumentpassedasseed.Foreverydifferentseedvalueusedinacalltosrand,thepseudo-randomnumbergeneratorcanbeexpectedtogenerateadifferentsuccessionofresultsinthesubsequentcallstoHYPERLINK"http://www.cplusplus.com/rand"rand.Twodifferentinitializationswiththesameseed,instructsthepseudo-randomgeneratortogeneratethesamesuccessionofresultsforthesubsequentcallstoHYPERLINK"http://www.cplusplus.com/rand"randinbothcases.Ifseedissetto1,thegeneratorisreinitializedtoitsinitialvalueandproducesthesamevaluesasbeforeanycalltoHYPERLINK"http://www.cplusplus.com/rand"randorsrand.Inordertogeneraterandom-likenumbers,srandisusuallyinitializedtosomedistinctivevalue,likethoserelatedwiththeexecutiontime.Forexample,thevaluereturnedbythefunctiontime(declaredinheader<ctime>)isdifferenteachsecond,whichisdistinctiveenoughformostrandomingneeds.ParametersseedAnintegervaluetobeusedasseedbythepseudo-randomnumbergeneratoralgorithm.ReturnValue(none)Example123456789101112/*srandexample*/#include<stdio.h>#include<stdlib.h>#include<time.h>intmain(){printf("Firstnumber:%d\n",rand()%100);srand(time(NULL));printf("Randomnumber:%d\n",rand()%100);srand(1);printf("Againthefirstnumber:%d\n",rand()%100);return0;}Output:Firstnumber:41Randomnumber:13Againthefirstnumber:41
