53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
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#include <stdio.h>
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#include <math.h>
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#include <stdlib.h>
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unsigned long long int randm(int n);
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unsigned long long int von(unsigned long long int x, int n);
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int main(void)
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{
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unsigned long long int x, s;
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int n, i, r;
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printf("Enter the number of digits in the seed value ");
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scanf("%d", &n);
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printf("\nEnter the total number of random numbers to be generated ");
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scanf("%d", &r);
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if (n >= 12)
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{
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printf("TOO LARGE!!");
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exit(0);
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}
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x = randm(n);
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for(i = 0; i < r; i++)
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{
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s = von(x, n);
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x = s;
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printf("\nRandom Number generated: %lld\n", s);
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}
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return 0;
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}
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/*Generating Random Number of desired digit*/
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unsigned long long int randm(int n)
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{
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double x;
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unsigned long long int y;
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srand(getpid());
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x = rand() / (double)RAND_MAX;
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y = (unsigned long long int) (x * pow(10.0, n*1.0));
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return y;
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}
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/*Calculating Random Number By Von Neumann Middle Square method*/
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unsigned long long int von(unsigned long long int x, int n)
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{
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unsigned long long int y;
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int k;
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k = n / 2;
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y =(unsigned long long int)((x / pow(10.0, k * 1.0)) * x) % (unsigned long long int) (pow(10.0, n * 1.0));
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return y;
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}
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