C program to generate pseudo-random numbers using rand and random function (Turbo C compiler only). As the random numbers are generated by an algorithm used in a function they are pseudo-random, this is the reason that word pseudo is used. Function rand() returns a pseudo-random number between 0 and RAND_MAX. RAND_MAX is a constant which is platform dependent and equals the maximum value returned by rand function.
Jun 23, 2017 rand and srand in C/C. Rand rand function is used in C to generate random numbers. If we generate a sequence of random number with rand function, it will create the same sequence again and again every time program runs. Aug 16, 2010 This is another new thing that you'll learn in C today. Today I show you how to create a program that acts as a random number generator and gives you a random number based on what the user. Use rand function. Like: x = rand% 50 + 1 printf('%d', x); this will print the random number generated by the rand function. I believe doing the 50 + 1 produces numbers 1-49 though? Idk, I forget. You should look up on how it works:P.
The rand function returns a pseudo-random number as a long int value. That value helps your code generate random numbers in the long int range. It can also be manipulated to yield random real number values, but that process involves. The rand function is prototyped in the stdlib.h header file.
C programming code using rand
We use modulus operator in our program. If you evaluate a % b where a and b are integers then result will always be less than b for any set of values of a and b. For example For a = 1243 and b = 100 a % b = 1243 % 100 = 43 For a = 99 and b = 100 a % b = 99 % 100 = 99 For a = 1000 and b = 100 a % b = 1000 % 100 = 0
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In our program we print pseudo random numbers in range [0, 100]. So we calculate rand() % 100 which will return a number in [0, 99] so we add 1 to get the desired range.
#include <stdio.h> #include <stdlib.h>
int main(){ int c, n;
printf('Ten random numbers in [1,100]n');
for(c =1; c <=10; c++){ n =rand()%100+1; printf('%dn', n); }
return0; }
If you rerun this program, you will get the same set of numbers. Mac boot camp with encryption key. To get different numbers every time you can use: srand(unsigned int seed) function; here seed is an unsigned integer. So you will need a different value of seed every time you run the program for that you can use current time which will always be different so you will get a different set of numbers. By default, seed = 1 if you do not use srand function.
C programming code using random function (Turbo C compiler only)
Function randomize is used to initialize random number generator. If you don't use it, then you will get same random numbers each time you run the program.
#include <stdio.h> #include <conio.h>
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#include <stdlib.h>
int main() { int n, max, num, c;
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printf('Enter the number of random numbers you wantn'); scanf('%d',&n);
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printf('Enter the maximum value of random numbern'); scanf('%d',&max);
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printf('%d random numbers from 0 to %d are:n', n, max); randomize();
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for(c =1; c <= n; c++) { num = random(max); printf('%dn',num); }