```
/***
* test2
*
* Plot pairs or triples of random numbers.
*
***/

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

#include "jims1Rand.h"

#define SYSRAND  0
#define JIM1RAND 1

// -----------------------------------------------------

// Prints out pairs of randoms.
// Inputs are
//   seed	  an unsigned int to initialize the generator
//   N		  number of randoms to look at
//   RandMax	  randoms are 0..(RandMax-1)
//   theSrand()   function which initialized the generator
//   theRand()	  function to return the next random
//
void printRandoms( int seed, int N, int dimensions, int RandMax,
void theSrand(unsigned int), int theRand() ){
int i, d;
theSrand(seed);
for (i=0; i<N; i++){
for (d=0; d<dimensions; d++){
printf("  %8.6f", ((double)theRand())/RandMax);
}
printf("\n");
}
}

// ------------------------------------------------------------

void printHelpAndExit(char* programName){
printf("Usage: %s randRoutine nPoints nDim\n", programName);
printf("  where randRoutine is an integer, 0=>rand(), 1=>jims1Rand(), \n");
printf("        nDim is an integer (2 or 3) = points per line, \n");
printf("  and   nPoints is the number of lines to output.\n");
exit(0);
}

// ------------------------------------------------------------

int string2integer(char* theString){
powerOfTen = 1;
for (i=strlen(theString)-1; i>=0; i--){
powerOfTen *= 10;
}
}

// ------------------------------------------------------------

int main(int argc, char* argv[]){
int nPoints, whichFunc, nDim;
int seed = 1234;

// If we've been passed too few arguments on command line, give some hints.
if (argc<4){
printHelpAndExit(argv[0]);
}
whichFunc = string2integer(argv[1]);
nPoints   = string2integer(argv[2]);
nDim	    = string2integer(argv[3]);

// printf(" whichFunc = %d \n", whichFunc);
// printf(" nPoints   = %d \n", nPoints);
// printf(" nDim      = %d \n", nDim);
// exit(0);

if (nDim<1 || nDim>10){
printf("Oops: illegal nDim value, should be >1 and <10.\n");
printHelpAndExit(argv[0]);
}

switch (whichFunc) {
case SYSRAND:
printRandoms(seed, nPoints, nDim,
RAND_MAX, srand, rand );
break;
case JIM1RAND:
printRandoms(seed, nPoints, nDim,
jims1GetRAND_MAX(), jims1Srand, jims1Rand );
break;
default:
printf("Oops: illegal randRoutine value '%c'.\n", *argv[1]);
printHelpAndExit(argv[0]);
}

}

// -----------------------------------------------------

// -- debug command line argument passing
// printf(" argc is '%d'. \n", argc);
// for (i=0; i<argc; i++){
//   printf(" argv[%d] = '%s'.\n", i, argv[i]);
// }

```

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