Making big samples with Park&Miller RNGs?

i'm trying to generate pseudo-random numbers with Park&Miller RNG ran0 1 2 3(3 doesn't work for the moment) in C++ from "Numerical Recipes in C". Theses generators work correctly because it makes samples uniformaly distributed between 0 and 1. My goal is to have a huge sample (10^10 at least) so i used malloc() function to allocate memory. My problem is that the sample is always to small (i'd like to have "j" random numbers generated, for example: if i initialize j=1000 i'll have 514 random numbers instead of 1000, in order to test things i made different "for" loops). I'm a total beginner in C++ (and in programming) and i fear a pointer problem, but i do not understand how to fix it. If someone has a solution or just a advice it would help me a lot because this problem seriously curb me in my internship (please be lenient with my approximative english :')). Here's the code:

int main(){
FILE* simulationr0 = fopen("E:/Simulation_stage/SimulationRan0","w");
FILE* simulationr1 = fopen("E:/Simulation_stage/SimulationRan1","w");
FILE* simulationr2 = fopen("E:/Simulation_stage/SimulationRan2","w");
FILE* simulationr3 = fopen("E:/Simulation_stage/SimulationRan3","w");
float d;
long j;
long seed;
printf("tapez 0 pour utiliser ran0\ntapez 1 pour utiliser ran1\ntapez 2 pour utiliser ran2\ntapez 3 pour utiliser ran3\ntapez 4 pour les utiliser tous");
scanf("%f",&d);
if( d!=0 & d!=1 & d!= 2 & d!= 3 & d!=4){
    printf("Erreur: valeur incorrecte//incorrect value\n");
    exit(0);}
printf("Combien de nombres pseudo-aleatoires ?// How many random numbers ?\n");
scanf("%lo",&j);
printf("Quelle graine ? Which seed ?\n");
scanf("%lo", &seed);
long *pseed=&seed;
if(d==4){
    float * ranp0;
    float * ranp1;
    float * ranp2;
    float * ranp3;
    ranp0 = (float*) malloc (j*sizeof(float));
    ranp1 = (float*) malloc (j*sizeof(float));
    ranp2 = (float*) malloc (j*sizeof(float));
    ranp3 = (float*) malloc (j*sizeof(float));
    for (int i=0;i<j+2;i+=1){
        ranp0[i]=ran0(pseed);
        ranp1[i]=ran1(pseed);
        ranp2[i]=ran2(pseed);
        ranp3[i]=ran3(pseed);
        fprintf(simulationr0,"%f\n", ranp0[i]);
        fprintf(simulationr1,"%f\n", ranp1[i]);
        fprintf(simulationr2,"%f\n", ranp2[i]);
        fprintf(simulationr3,"%f\n", ranp3[i]);
    }
    fclose(simulationr0);
    fclose(simulationr1);
    fclose(simulationr2);
    fclose(simulationr3);
    system("PAUSE");
    free(ranp0);
    free(ranp1);
    free(ranp2);
    free(ranp3);}
if(d==0){
    float * ranp0;
    ranp0 = (float*) malloc (j*sizeof(float));
    for (int i=0;i<j+2;i++){
        ranp0[i]=ran0(pseed);
        fprintf(simulationr0,"%f\n", ranp0[i]);}
    fclose(simulationr0);
    system("PAUSE");
    free(ranp0);}
if(d==1){
    float * ranp1;
    ranp1 = (float*) malloc (j*sizeof(float));
    for (int i=0;i<j+2;i++){
        ranp1[i]=ran1(pseed);
        fprintf(simulationr1,"%f\n", ranp1[i]);}
    fclose(simulationr1);
    system("PAUSE");
    free(ranp1);}
if(d==2){
    float * ranp2;
    ranp2 = (float*) malloc(j*sizeof(long));
    for (int i=0;i!=j;i=i+1){
        ranp2[i]=ran2(pseed);
        fprintf(simulationr2,"%f\n", ranp2[i]);}
    fclose(simulationr2);
    system("PAUSE");
    free(ranp2);}
if(d==3){
    float * ranp3;
    ranp3 = (float*) malloc(j*sizeof(float));
    for (int i=0;i<j+2;i++){
        ranp3[i]=ran3(pseed);
        fprintf(simulationr3,"%f\n", ranp3[i]);}
    fclose(simulationr3);
    system("PAUSE");
    free(ranp3);}
system("PAUSE");
exit(1);}