What’s the difference between rand() & srand() function?

Answer 1

The function rand() is used to generate the pseudo random number. It returns an integer value and its range is from 0 to rand_max i.e 32767.
syntax of rand() :
int rand(void);

Example

#include <stdio.h>
#include<stdlib.h>
int main()
{    printf("%d\n", rand());    
printf("%d", rand());    return 0; }

Output

1804289383
846930886

The function srand() is used to initialize the generated pseudo random number by rand() function. It does not return anything.
syntax of srand() :
void srand(unsigned int number);

Example

#include <stdio.h>
#include<stdlib.h>
#include<time.h> int main() {    srand(time(NULL));  
 printf("%d\n", rand());    
srand(12);    
printf("%d", rand());    return 0; }

Output

1432462941
1687063760