ch7-frand (Float rand)

Chapter_7     Exercise_7-8     system

Exercise_7-9

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frand.c     K&R, p. 168         download

#include <stdio.h> // for printf()
#include <stdlib.h> // for rand(), srand(), RAND_MAX
#include <time.h> // for time_t, time()
#include <limits.h> // for INT_MAX

double frand(void); // floating point rand()

int main()
{
printf("RAND_MAX: %d\n", RAND_MAX);
printf("INT_MAX: %d\n", INT_MAX);

time_t t;
srand((unsigned) time(&t)); // seed rand()

printf("frand(): %lf\n", frand());

return 0;
}

double frand(void) // floating point rand()
{
return (double) rand() / (RAND_MAX + 1.0);
}
/*
gcc frand.c -o frand
./frand
RAND_MAX: 2147483647
INT_MAX: 2147483647
frand(): 0.326507
*/

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Chapter_7     Exercise_7-8     system

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