# rand() Function in C Language – Linux Hint

Within the C language, the rand() operate is used for Pseudo Quantity Generator(PRNG). The random numbers generated by the rand() operate usually are not really random. It’s a sequence that repeats periodically, however the interval is so giant that we are able to ignore it. The rand() operate works by remembering a seed worth that’s used to compute the following random quantity and the following new seed. On this article, we’re going to talk about intimately how random numbers might be generated utilizing the rand() operate. So, let’s get began!

stdlib.h

int rand (void)

## Return values:

This operate returns the following pseudo-random quantity within the sequence. The vary worth of the quantity sequence is between Zero and RAND_MAX. RAND_MAX is a macro outlined in stdlib.h header file, whose worth is the utmost worth, which might return by rand() operate. The worth of RAND_MAX is bigger however not lower than 32767 relying on the C libraries.

//Example1.c

#embody
#embody

int essential()
{

int i;

printf(“10 Random Numbers =>n”);

for(i=0;i<10;i++)
{
printf(“%d “,rand());
}

printf(“n”);
return 0;
}

In Example1.c, we name the rand() operate in every iteration of for loop and print the return worth of the operate. The worth sequence of the rand() operate is identical every time we run this system. By default, the seed of the rand operate is ready to 1.

We are able to set the seed for the rand operate utilizing the srand() operate. The seed might be set solely as soon as, and earlier than the primary time rand() operate name.

stdlib.h

## Syntax:

int srand (unsigned int seed)

## Arguments:

This operate takes 1 argument

seed: An integer worth used as a seed for a brand new sequence of pseudo-random numbers.

## Return values:

None

//Example2.c

#embody
#embody
#embody

int essential()
{

int i;

srand(time(0));

printf(“10 Random Numbers =>n”);

for(i=0;i<10;i++)
{
printf(“%d “,rand());
}

printf(“n”);
return 0;
}

In Example2.c, we’ve used the srand() operate to set the preliminary seed of the random quantity sequence generated by rand() operate. Every time this system is run, a special sequence is generated. In srand(), time(0) operate (declared in time.h header file) is used as a seed. This time(0) operate returns the variety of seconds elapsed for the reason that epoch (00:00:00, January 1, 1970). This nonetheless could produce the identical sequences if you happen to run this system in the identical second.

//Example3.c

#embody
#embody
#embody

int essential()
{

int i;

srand(time(0));

printf(“10 Random Numbers between 1 and 10=>n”);

for(i=0;i<10;i++)
{
printf(“%d “,(rand() %10) + 1);
}

printf(“n”);
return 0;
}

In Example3.c we’ve seen how random numbers might be generated between 1 and 10.

//Example4.c

#embody
#embody
#embody

int essential()
{

int i,max,min;

printf(“Enter Min worth => “);
scanf(“%d”,&min);
printf(“Enter Max worth => “);
scanf(“%d”,&max);

if(min>max)

printf(“Min worth is bigger than max valuen”);
return 0;

srand(time(0));

printf(“10 Random Numbers between %d and %d=>n”,min,max);

for(i=0;i<10;i++)
{
printf(“%d “,(rand() % (max – min +1)) + min);
}

printf(“n”);
return 0;
}

In Example4.c we’ve taken the vary from the consumer and generated a random quantity inside this vary. The system is: rand() % (max – min +1)) + min

//Example5.c

#embody
#embody
#embody

int essential()
{

int i;

srand(time(0));

printf(“10 Random Numbers between 0.Zero and 1.0=>n”);

for(i=0;i<10;i++)
{
printf(“%f “,((float)rand() /RAND_MAX));
}

printf(“n”);
return 0;
}

In Example5.c, we’ve seen how we are able to generate random numbers between float 0.Zero and 1.Zero The system is: (float)rand() /RAND_MAX)

//Example6.c

#embody
#embody
#embody

int essential()
{

int i;
float max,min;

printf(“Enter Min worth => “);
scanf(“%f”,&min);
printf(“Enter Max worth => “);
scanf(“%f”,&max);

if(min>max)

printf(“Min worth is bigger than max valuen”);
return 0;

srand(time(0));

printf(“10 Random Numbers between %f and %f =>n”,min,max);

for(i=0;i<10;i++)
{
printf(“%f “,min + ((float)rand() /(RAND_MAX/(max – min))));
}

printf(“n”);
return 0;
}

In Example6.c, we’ve taken the vary from the consumer and generated a random quantity inside this vary (each inclusive). The system is: min + ((float)rand() /(RAND_MAX/(max – min)))

## Conclusion:

On this article, we’ve realized how random numbers might be generated utilizing the rand() and srand() operate. There are not any ensures concerning the high quality of the random numbers generated by the rand operate, however it’s ok for informal use.

## Sources:

n.d., (2008, October 14). Objective of the GNU C Library.. Retrieved from http://internet.archive.org/internet/20081014160228/http://waitaki.otago.ac.nz/docs/glibc/libc_19.html

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