How to Generate Random Numbers in C Language

In C, you can generate random numbers using two key functions:

1. rand(): generates a random integer
2. srand(): seeds the random number generator to vary the sequence

Method 1: Using rand()

The rand() function returns a pseudo-random integer. You can scale or mod it to fit a desired range.

#include <stdio.h>
#include <stdlib.h>

int main() {
  int random_number = rand();
  printf("Random Number: %d\n", random_number);
  return 0;
}

Method 2: Using srand()

The srand() function seeds the random number generator, typically with the current time, to ensure the random sequence varies on each program run.

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main() {
  srand(time(0));
  int random_number = rand();
  printf("Random Number: %d\n", random_number);
  return 0;
}

Conclusion

Using srand() and rand() together allows you to generate random numbers effectively in C.

• rand() generates random numbers.
• srand() seeds the random number generator for varied output.

Happy coding!