123

#include <stdio.h>
int main(){
    double** a;
    int n = 3, m = 3;

    a = (double**)calloc(n, sizeof(double*));
    for (int i = 0; i < n; i++) a[i] = (double*)calloc(m, sizeof(double));
    a[0][2] = 3.14;
    //for () {
    //  for() a
    //}
    printf("%1.9f", a[0][2]);

}