Modified

/* You do not ever need conio.h, it is obsolete! */
#include <stdio.h>
#include <stdlib.h>

/* Slightly modified prototype */
int R(int N,int M, float **matris);

int main(void) {
    int i,j,c,N,M,count;
    float **matris;

    printf("Define array size(NxM): ");
    scanf("%d  %d", &N,&M);
    matris=(float **)malloc(N*sizeof(int));
    for(i=0;i<M;i++) {
        matris[i]=(float *)malloc(N*sizeof(int));
    }
    //read(N,M);
    /* Must get count of negative from function return*/
    count = R(N,M,matris);
    if(count==0)
        printf("There are no negative numbers in array.\n");
    else
        printf("Number of negative values: %d\n",count);
    return 0;
}

/* Return value is an integer, the count of negatives */
int R(int N,int M, float **matris) {
    int i,j,count=0; /* You must initialize count to 0 */

    for(i=0;i<N;i++) {
        for(j=0;j<M;j++) {
            printf("Please enter value of array[%d][%d] :",i,j);
            /* Matris is a float array! */
            scanf("%f",&matris[i][j]);
        }
    }

    for(i=0; i<N; i++) {
        for(j=0;j<M;j++) {
            //printf(" %f ", matris[i][j]);
            if(matris[i][j]<0) {
                /* You can not do this as num2 is not an array! */
                //*num2[count]=matris[k][l];
                count++;
            }
        }
        //printf("\n");
    }

    return count;
}