In C/C++, rand() and srand() are translated as follows:

In this article, we will discuss the working principle, syntax and examples of rand() and srand() functions in C STL.

What is rand()?

rand() function is a built-in function in C STL and is defined in the header file. rand() is used to generate a series of random numbers. We can use this function when we want to generate random numbers in code.

Just like when we make ludo game in C, we have to generate any random number between 1 and 6 so we can use rand () to generate random numbers.

Random numbers are generated by using an algorithm that gives a series of unrelated A number is generated whenever this function is called.

Just like we want to generate a random number between 1-6, we can use this function like -

Num = rand() % 6 1;

Syntax

int rand();

Parameters

This function does not accept parameters -

Return value

This function returns an integer value between 0 and RAND_MAX.

Input

rand() % 100 +1;

Output

Example

rand()

Live Demo

#include <stdio.h>
#include <stdlib.h&g;
int main(void){
   printf("Randomly generated numbers are: ");
   for(int i = 0; i<5; i++)
      printf(" %d ", rand());
   return 0;
}

Output

If we run this code for the first time, the output will be -

Randomly generated numbers are: 1804289383 846930886 1681692777 1714636915
1957747793

If we run this code for the Nth time , the output will be -

Randomly generated numbers are: 1804289383 846930886 1681692777 1714636915
1957747793

What is srand()?

srand() function is a built-in function in C STL and is defined in the header file. srand() is used to initialize the random number generator. This function provides a starting point for generating a series of pseudorandom integers. This parameter is passed as the seed for generating pseudo-random numbers. The pseudonumber generator can produce the same different series of results as rand() whenever different seed values ​​are used in srand.

Syntax

int srand(unsigned int seed);

Parameters

The function accepts the following parameters -

• Seed - This is pseudo The integer used as seed for the random number generator.

Return value

This function returns a pseudo-generated random number.

Input

srand(time(0));
rand();

Output

1804289383

Example

srand()

Live Demo

#include <stdio.h>
#include <stdlib.h>
#include<time.h>
int main(void){
   srand(time(0));
   printf("Randomly generated numbers are: ");
   for(int i = 0; i<5; i++)
      printf(" %d ", rand());
   return 0;
}

Output

If we run this code for the first time, the output will be -

Randomly generated numbers are: 382366186 1045528146 1291469435 515349891
931606430

If we run this code for the second time , the output will be -

Randomly generated numbers are: 1410939666 214525217 875042802
1560673843 782892338

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