I have a project to write cache simulation in C and so far i am stuck on allocating space for an array and program crashes. Please help me out.
I have to use pointers in this program. When i had array simply created in the main function, there were no problems, but after making a pointer to in global, program started to crash and i have to have it global. Its one of the requirements. 

```
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <assert.h>

int INDEXLENGTH; // global variable for num of bits in index
int OFFSETLENGTH; // global variable for num of bits in byte offset
int TAGBITS; // global variable for num of bits in the tag
int misses=0; //variable for total number of misses
int hits=0;
int **tagAr; // LRUArray pointer
int **lruAr; // tagArray pointer
int cacheSize; // user specified size of cache
int blockSize; // user specified size of each block
int linesperset;
int sets;

int main(void)
{
    int i; // simply a few variables for future for loops
    int j;

    printf("Welcome to Lab A Cache Simulator by Divya, Alex and Jenn.\n");
    printf("To begin, please input the size of the cache you will be simulating in bytes.\n");
    scanf(" %d", &cacheSize); // (cache size in bytes) is read in from the user
    printf("You have inputed this: %d\n", cacheSize);

    printf("Next, please input the size of each cache line in bytes.\n");
    scanf(" %d", &blockSize); // blocksize is read in from the user
    printf("You have inputed this: %d\n", blockSize);

    printf("Finally, please input the number of ways of associativity for this cache.\n");
    printf("Also, input the number as a power of 2.\n");
    scanf(" %d", &linesperset); // linesperset is read in from the user
    printf("You have inputed this: %d\n", linesperset);

    sets = (cacheSize/(blockSize*linesperset));
    printf("Variable sets is: %d\n", sets);

    tagAr=(int **)malloc(sets*sizeof(int *)); // allocating space for "l" array pointers
    for (i=0; i<sets; i++) tagAr[i]=(int *)malloc(linesperset*sizeof(int)); //allocates space for k columns for each p[i]

    lruAr=(int **)malloc(sets*sizeof(int *)); // allocating space for "l" array pointers
    for (i=0; i<sets; i++) lruAr[i]=(int *)malloc(linesperset*sizeof(int)); //allocates space for k columns for each p[i]

    for (i=0; i<sets; i++)
        {
            for (j=0; j<blockSize; j++)
            {
                tagAr[i][j] = -1;
                lruAr[i][j] = -1;
            }
        }

    for (i = 0; i < sets; i++) //This part of the code prints array for debuging purposes
        {
            for (j = 0; j < blockSize; j++)
            {
                printf(" %d", lruAr[i][j]);
            }
            printf("\n");
            printf("\n");
        }

    printf("This is the value of IndexLength before setting, should be 0 : %d\n", INDEXLENGTH); //only for debuging purposes
    setIndexLength();
    printf("This is the value of IndexLength after setting: %d\n", INDEXLENGTH); //only for debuging purposes
    printf("This is the value of OffsetLength before setting, should be 0 : %d\n", OFFSETLENGTH); //only for debuging purposes
    offsetLength();
    printf("This is the value of OffsetLength after setting: %d\n", OFFSETLENGTH); //only for debuging purposes

    return misses;
}

```