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How to generate different random numbers in a loop in C++?
Let us see how to generate different random numbers using C++. Here we are generating random numbers in range 0 to some value. (In this program the max value is 100).
To perform this operation we are using the srand() function. This is in the C++ library. The function void srand(unsigned int seed) seeds the random number generator used by the function rand.
The declaration of srand() is like below −
void srand(unsigned int seed)
It takes a parameter called seed. This is an integer value to be used as seed by the pseudo-random number generator algorithm. This function returns nothing.
To get the number we need the rand() method. To get the number in range 0 to max, we are using modulus operator to get the remainder.
For the seed value we are providing the time(0) function result into the srand() function.
Example
#include<iostream> #include<cstdlib> #include<ctime> using namespace std; main() { int max; max = 100; //set the upper bound to generate the random number srand(time(0)); for(int i = 0; i<10; i++) { //generate 10 random numbers cout << "The random number is: "<<rand()%max << endl; } }
Output
The random number is: 6 The random number is: 82 The random number is: 51 The random number is: 46 The random number is: 97 The random number is: 60 The random number is: 20 The random number is: 2 The random number is: 55 The random number is: 91
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