C infinite loop problem

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

static int matrix[5][4], control[5][4];
int i,k,j;
void generate_matrix();
void main() {
    generate_matrix();
}

void generate_matrix(){
    for(i=0;i<=5;i++){
        k = i+1;
        matrix[i][0] = k;
        matrix[i][1] = k*10;
        matrix[i][2] = k*100;
        matrix[i][3] = k*10000;
        /*
         * HERE IS WHERE I GET THE PROBLEM
         */
        for(j=0;j<4;j++){
            control[i][j] = 0;
        }
    }
}